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// Copyright 2007, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Google Mock - a framework for writing C++ mock classes.
//
// This file implements some commonly used argument matchers. More
// matchers can be defined by the user implementing the
// MatcherInterface<T> interface if necessary.
//
// See googletest/include/gtest/gtest-matchers.h for the definition of class
// Matcher, class MatcherInterface, and others.
// GOOGLETEST_CM0002 DO NOT DELETE
#ifndef GMOCK_INCLUDE_GMOCK_GMOCK_MATCHERS_H_
#define GMOCK_INCLUDE_GMOCK_GMOCK_MATCHERS_H_
#include <math.h>
#include <algorithm>
#include <initializer_list>
#include <iterator>
#include <limits>
#include <memory>
#include <ostream> // NOLINT
#include <sstream>
#include <string>
#include <type_traits>
#include <utility>
#include <vector>
#include "gmock/internal/gmock-internal-utils.h"
#include "gmock/internal/gmock-port.h"
#include "gtest/gtest.h"
// MSVC warning C5046 is new as of VS2017 version 15.8.
#if defined(_MSC_VER) && _MSC_VER >= 1915
#define GMOCK_MAYBE_5046_ 5046
#else
#define GMOCK_MAYBE_5046_
#endif
GTEST_DISABLE_MSC_WARNINGS_PUSH_(
4251 GMOCK_MAYBE_5046_ /* class A needs to have dll-interface to be used by
clients of class B */
/* Symbol involving type with internal linkage not defined */)
namespace testing {
// To implement a matcher Foo for type T, define:
// 1. a class FooMatcherImpl that implements the
// MatcherInterface<T> interface, and
// 2. a factory function that creates a Matcher<T> object from a
// FooMatcherImpl*.
//
// The two-level delegation design makes it possible to allow a user
// to write "v" instead of "Eq(v)" where a Matcher is expected, which
// is impossible if we pass matchers by pointers. It also eases
// ownership management as Matcher objects can now be copied like
// plain values.
// A match result listener that stores the explanation in a string.
class StringMatchResultListener : public MatchResultListener {
public:
StringMatchResultListener() : MatchResultListener(&ss_) {}
// Returns the explanation accumulated so far.
std::string str() const { return ss_.str(); }
// Clears the explanation accumulated so far.
void Clear() { ss_.str(""); }
private:
::std::stringstream ss_;
GTEST_DISALLOW_COPY_AND_ASSIGN_(StringMatchResultListener);
};
// Anything inside the 'internal' namespace IS INTERNAL IMPLEMENTATION
// and MUST NOT BE USED IN USER CODE!!!
namespace internal {
// The MatcherCastImpl class template is a helper for implementing
// MatcherCast(). We need this helper in order to partially
// specialize the implementation of MatcherCast() (C++ allows
// class/struct templates to be partially specialized, but not
// function templates.).
// This general version is used when MatcherCast()'s argument is a
// polymorphic matcher (i.e. something that can be converted to a
// Matcher but is not one yet; for example, Eq(value)) or a value (for
// example, "hello").
template <typename T, typename M>
class MatcherCastImpl {
public:
static Matcher<T> Cast(const M& polymorphic_matcher_or_value) {
// M can be a polymorphic matcher, in which case we want to use
// its conversion operator to create Matcher<T>. Or it can be a value
// that should be passed to the Matcher<T>'s constructor.
//
// We can't call Matcher<T>(polymorphic_matcher_or_value) when M is a
// polymorphic matcher because it'll be ambiguous if T has an implicit
// constructor from M (this usually happens when T has an implicit
// constructor from any type).
//
// It won't work to unconditionally implict_cast
// polymorphic_matcher_or_value to Matcher<T> because it won't trigger
// a user-defined conversion from M to T if one exists (assuming M is
// a value).
return CastImpl(polymorphic_matcher_or_value,
bool_constant<std::is_convertible<M, Matcher<T>>::value>(),
bool_constant<std::is_convertible<M, T>::value>());
}
private:
template <bool Ignore>
static Matcher<T> CastImpl(const M& polymorphic_matcher_or_value,
bool_constant<true> /* convertible_to_matcher */,
bool_constant<Ignore>) {
// M is implicitly convertible to Matcher<T>, which means that either
// M is a polymorphic matcher or Matcher<T> has an implicit constructor
// from M. In both cases using the implicit conversion will produce a
// matcher.
//
// Even if T has an implicit constructor from M, it won't be called because
// creating Matcher<T> would require a chain of two user-defined conversions
// (first to create T from M and then to create Matcher<T> from T).
return polymorphic_matcher_or_value;
}
// M can't be implicitly converted to Matcher<T>, so M isn't a polymorphic
// matcher. It's a value of a type implicitly convertible to T. Use direct
// initialization to create a matcher.
static Matcher<T> CastImpl(const M& value,
bool_constant<false> /* convertible_to_matcher */,
bool_constant<true> /* convertible_to_T */) {
return Matcher<T>(ImplicitCast_<T>(value));
}
// M can't be implicitly converted to either Matcher<T> or T. Attempt to use
// polymorphic matcher Eq(value) in this case.
//
// Note that we first attempt to perform an implicit cast on the value and
// only fall back to the polymorphic Eq() matcher afterwards because the
// latter calls bool operator==(const Lhs& lhs, const Rhs& rhs) in the end
// which might be undefined even when Rhs is implicitly convertible to Lhs
// (e.g. std::pair<const int, int> vs. std::pair<int, int>).
//
// We don't define this method inline as we need the declaration of Eq().
static Matcher<T> CastImpl(const M& value,
bool_constant<false> /* convertible_to_matcher */,
bool_constant<false> /* convertible_to_T */);
};
// This more specialized version is used when MatcherCast()'s argument
// is already a Matcher. This only compiles when type T can be
// statically converted to type U.
template <typename T, typename U>
class MatcherCastImpl<T, Matcher<U> > {
public:
static Matcher<T> Cast(const Matcher<U>& source_matcher) {
return Matcher<T>(new Impl(source_matcher));
}
private:
class Impl : public MatcherInterface<T> {
public:
explicit Impl(const Matcher<U>& source_matcher)
: source_matcher_(source_matcher) {}
// We delegate the matching logic to the source matcher.
bool MatchAndExplain(T x, MatchResultListener* listener) const override {
using FromType = typename std::remove_cv<typename std::remove_pointer<
typename std::remove_reference<T>::type>::type>::type;
using ToType = typename std::remove_cv<typename std::remove_pointer<
typename std::remove_reference<U>::type>::type>::type;
// Do not allow implicitly converting base*/& to derived*/&.
static_assert(
// Do not trigger if only one of them is a pointer. That implies a
// regular conversion and not a down_cast.
(std::is_pointer<typename std::remove_reference<T>::type>::value !=
std::is_pointer<typename std::remove_reference<U>::type>::value) ||
std::is_same<FromType, ToType>::value ||
!std::is_base_of<FromType, ToType>::value,
"Can't implicitly convert from <base> to <derived>");
return source_matcher_.MatchAndExplain(static_cast<U>(x), listener);
}
void DescribeTo(::std::ostream* os) const override {
source_matcher_.DescribeTo(os);
}
void DescribeNegationTo(::std::ostream* os) const override {
source_matcher_.DescribeNegationTo(os);
}
private:
const Matcher<U> source_matcher_;
GTEST_DISALLOW_ASSIGN_(Impl);
};
};
// This even more specialized version is used for efficiently casting
// a matcher to its own type.
template <typename T>
class MatcherCastImpl<T, Matcher<T> > {
public:
static Matcher<T> Cast(const Matcher<T>& matcher) { return matcher; }
};
} // namespace internal
// In order to be safe and clear, casting between different matcher
// types is done explicitly via MatcherCast<T>(m), which takes a
// matcher m and returns a Matcher<T>. It compiles only when T can be
// statically converted to the argument type of m.
template <typename T, typename M>
inline Matcher<T> MatcherCast(const M& matcher) {
return internal::MatcherCastImpl<T, M>::Cast(matcher);
}
// Implements SafeMatcherCast().
//
// FIXME: The intermediate SafeMatcherCastImpl class was introduced as a
// workaround for a compiler bug, and can now be removed.
template <typename T>
class SafeMatcherCastImpl {
public:
// This overload handles polymorphic matchers and values only since
// monomorphic matchers are handled by the next one.
template <typename M>
static inline Matcher<T> Cast(const M& polymorphic_matcher_or_value) {
return internal::MatcherCastImpl<T, M>::Cast(polymorphic_matcher_or_value);
}
// This overload handles monomorphic matchers.
//
// In general, if type T can be implicitly converted to type U, we can
// safely convert a Matcher<U> to a Matcher<T> (i.e. Matcher is
// contravariant): just keep a copy of the original Matcher<U>, convert the
// argument from type T to U, and then pass it to the underlying Matcher<U>.
// The only exception is when U is a reference and T is not, as the
// underlying Matcher<U> may be interested in the argument's address, which
// is not preserved in the conversion from T to U.
template <typename U>
static inline Matcher<T> Cast(const Matcher<U>& matcher) {
// Enforce that T can be implicitly converted to U.
GTEST_COMPILE_ASSERT_((std::is_convertible<T, U>::value),
"T must be implicitly convertible to U");
// Enforce that we are not converting a non-reference type T to a reference
// type U.
GTEST_COMPILE_ASSERT_(
std::is_reference<T>::value || !std::is_reference<U>::value,
cannot_convert_non_reference_arg_to_reference);
// In case both T and U are arithmetic types, enforce that the
// conversion is not lossy.
typedef GTEST_REMOVE_REFERENCE_AND_CONST_(T) RawT;
typedef GTEST_REMOVE_REFERENCE_AND_CONST_(U) RawU;
const bool kTIsOther = GMOCK_KIND_OF_(RawT) == internal::kOther;
const bool kUIsOther = GMOCK_KIND_OF_(RawU) == internal::kOther;
GTEST_COMPILE_ASSERT_(
kTIsOther || kUIsOther ||
(internal::LosslessArithmeticConvertible<RawT, RawU>::value),
conversion_of_arithmetic_types_must_be_lossless);
return MatcherCast<T>(matcher);
}
};
template <typename T, typename M>
inline Matcher<T> SafeMatcherCast(const M& polymorphic_matcher) {
return SafeMatcherCastImpl<T>::Cast(polymorphic_matcher);
}
// A<T>() returns a matcher that matches any value of type T.
template <typename T>
Matcher<T> A();
// Anything inside the 'internal' namespace IS INTERNAL IMPLEMENTATION
// and MUST NOT BE USED IN USER CODE!!!
namespace internal {
// If the explanation is not empty, prints it to the ostream.
inline void PrintIfNotEmpty(const std::string& explanation,
::std::ostream* os) {
if (explanation != "" && os != nullptr) {
*os << ", " << explanation;
}
}
// Returns true if the given type name is easy to read by a human.
// This is used to decide whether printing the type of a value might
// be helpful.
inline bool IsReadableTypeName(const std::string& type_name) {
// We consider a type name readable if it's short or doesn't contain
// a template or function type.
return (type_name.length() <= 20 ||
type_name.find_first_of("<(") == std::string::npos);
}
// Matches the value against the given matcher, prints the value and explains
// the match result to the listener. Returns the match result.
// 'listener' must not be NULL.
// Value cannot be passed by const reference, because some matchers take a
// non-const argument.
template <typename Value, typename T>
bool MatchPrintAndExplain(Value& value, const Matcher<T>& matcher,
MatchResultListener* listener) {
if (!listener->IsInterested()) {
// If the listener is not interested, we do not need to construct the
// inner explanation.
return matcher.Matches(value);
}
StringMatchResultListener inner_listener;
const bool match = matcher.MatchAndExplain(value, &inner_listener);
UniversalPrint(value, listener->stream());
#if GTEST_HAS_RTTI
const std::string& type_name = GetTypeName<Value>();
if (IsReadableTypeName(type_name))
*listener->stream() << " (of type " << type_name << ")";
#endif
PrintIfNotEmpty(inner_listener.str(), listener->stream());
return match;
}
// An internal helper class for doing compile-time loop on a tuple's
// fields.
template <size_t N>
class TuplePrefix {
public:
// TuplePrefix<N>::Matches(matcher_tuple, value_tuple) returns true
// if the first N fields of matcher_tuple matches the first N
// fields of value_tuple, respectively.
template <typename MatcherTuple, typename ValueTuple>
static bool Matches(const MatcherTuple& matcher_tuple,
const ValueTuple& value_tuple) {
return TuplePrefix<N - 1>::Matches(matcher_tuple, value_tuple) &&
std::get<N - 1>(matcher_tuple).Matches(std::get<N - 1>(value_tuple));
}
// TuplePrefix<N>::ExplainMatchFailuresTo(matchers, values, os)
// describes failures in matching the first N fields of matchers
// against the first N fields of values. If there is no failure,
// nothing will be streamed to os.
template <typename MatcherTuple, typename ValueTuple>
static void ExplainMatchFailuresTo(const MatcherTuple& matchers,
const ValueTuple& values,
::std::ostream* os) {
// First, describes failures in the first N - 1 fields.
TuplePrefix<N - 1>::ExplainMatchFailuresTo(matchers, values, os);
// Then describes the failure (if any) in the (N - 1)-th (0-based)
// field.
typename std::tuple_element<N - 1, MatcherTuple>::type matcher =
std::get<N - 1>(matchers);
typedef typename std::tuple_element<N - 1, ValueTuple>::type Value;
const Value& value = std::get<N - 1>(values);
StringMatchResultListener listener;
if (!matcher.MatchAndExplain(value, &listener)) {
*os << " Expected arg #" << N - 1 << ": ";
std::get<N - 1>(matchers).DescribeTo(os);
*os << "\n Actual: ";
// We remove the reference in type Value to prevent the
// universal printer from printing the address of value, which
// isn't interesting to the user most of the time. The
// matcher's MatchAndExplain() method handles the case when
// the address is interesting.
internal::UniversalPrint(value, os);
PrintIfNotEmpty(listener.str(), os);
*os << "\n";
}
}
};
// The base case.
template <>
class TuplePrefix<0> {
public:
template <typename MatcherTuple, typename ValueTuple>
static bool Matches(const MatcherTuple& /* matcher_tuple */,
const ValueTuple& /* value_tuple */) {
return true;
}
template <typename MatcherTuple, typename ValueTuple>
static void ExplainMatchFailuresTo(const MatcherTuple& /* matchers */,
const ValueTuple& /* values */,
::std::ostream* /* os */) {}
};
// TupleMatches(matcher_tuple, value_tuple) returns true if all
// matchers in matcher_tuple match the corresponding fields in
// value_tuple. It is a compiler error if matcher_tuple and
// value_tuple have different number of fields or incompatible field
// types.
template <typename MatcherTuple, typename ValueTuple>
bool TupleMatches(const MatcherTuple& matcher_tuple,
const ValueTuple& value_tuple) {
// Makes sure that matcher_tuple and value_tuple have the same
// number of fields.
GTEST_COMPILE_ASSERT_(std::tuple_size<MatcherTuple>::value ==
std::tuple_size<ValueTuple>::value,
matcher_and_value_have_different_numbers_of_fields);
return TuplePrefix<std::tuple_size<ValueTuple>::value>::Matches(matcher_tuple,
value_tuple);
}
// Describes failures in matching matchers against values. If there
// is no failure, nothing will be streamed to os.
template <typename MatcherTuple, typename ValueTuple>
void ExplainMatchFailureTupleTo(const MatcherTuple& matchers,
const ValueTuple& values,
::std::ostream* os) {
TuplePrefix<std::tuple_size<MatcherTuple>::value>::ExplainMatchFailuresTo(
matchers, values, os);
}
// TransformTupleValues and its helper.
//
// TransformTupleValuesHelper hides the internal machinery that
// TransformTupleValues uses to implement a tuple traversal.
template <typename Tuple, typename Func, typename OutIter>
class TransformTupleValuesHelper {
private:
typedef ::std::tuple_size<Tuple> TupleSize;
public:
// For each member of tuple 't', taken in order, evaluates '*out++ = f(t)'.
// Returns the final value of 'out' in case the caller needs it.
static OutIter Run(Func f, const Tuple& t, OutIter out) {
return IterateOverTuple<Tuple, TupleSize::value>()(f, t, out);
}
private:
template <typename Tup, size_t kRemainingSize>
struct IterateOverTuple {
OutIter operator() (Func f, const Tup& t, OutIter out) const {
*out++ = f(::std::get<TupleSize::value - kRemainingSize>(t));
return IterateOverTuple<Tup, kRemainingSize - 1>()(f, t, out);
}
};
template <typename Tup>
struct IterateOverTuple<Tup, 0> {
OutIter operator() (Func /* f */, const Tup& /* t */, OutIter out) const {
return out;
}
};
};
// Successively invokes 'f(element)' on each element of the tuple 't',
// appending each result to the 'out' iterator. Returns the final value
// of 'out'.
template <typename Tuple, typename Func, typename OutIter>
OutIter TransformTupleValues(Func f, const Tuple& t, OutIter out) {
return TransformTupleValuesHelper<Tuple, Func, OutIter>::Run(f, t, out);
}
// Implements A<T>().
template <typename T>
class AnyMatcherImpl : public MatcherInterface<const T&> {
public:
bool MatchAndExplain(const T& /* x */,
MatchResultListener* /* listener */) const override {
return true;
}
void DescribeTo(::std::ostream* os) const override { *os << "is anything"; }
void DescribeNegationTo(::std::ostream* os) const override {
// This is mostly for completeness' safe, as it's not very useful
// to write Not(A<bool>()). However we cannot completely rule out
// such a possibility, and it doesn't hurt to be prepared.
*os << "never matches";
}
};
// Implements _, a matcher that matches any value of any
// type. This is a polymorphic matcher, so we need a template type
// conversion operator to make it appearing as a Matcher<T> for any
// type T.
class AnythingMatcher {
public:
template <typename T>
operator Matcher<T>() const { return A<T>(); }
};
// Implements the polymorphic IsNull() matcher, which matches any raw or smart
// pointer that is NULL.
class IsNullMatcher {
public:
template <typename Pointer>
bool MatchAndExplain(const Pointer& p,
MatchResultListener* /* listener */) const {
return p == nullptr;
}
void DescribeTo(::std::ostream* os) const { *os << "is NULL"; }
void DescribeNegationTo(::std::ostream* os) const {
*os << "isn't NULL";
}
};
// Implements the polymorphic NotNull() matcher, which matches any raw or smart
// pointer that is not NULL.
class NotNullMatcher {
public:
template <typename Pointer>
bool MatchAndExplain(const Pointer& p,
MatchResultListener* /* listener */) const {
return p != nullptr;
}
void DescribeTo(::std::ostream* os) const { *os << "isn't NULL"; }
void DescribeNegationTo(::std::ostream* os) const {
*os << "is NULL";
}
};
// Ref(variable) matches any argument that is a reference to
// 'variable'. This matcher is polymorphic as it can match any
// super type of the type of 'variable'.
//
// The RefMatcher template class implements Ref(variable). It can
// only be instantiated with a reference type. This prevents a user
// from mistakenly using Ref(x) to match a non-reference function
// argument. For example, the following will righteously cause a
// compiler error:
//
// int n;
// Matcher<int> m1 = Ref(n); // This won't compile.
// Matcher<int&> m2 = Ref(n); // This will compile.
template <typename T>
class RefMatcher;
template <typename T>
class RefMatcher<T&> {
// Google Mock is a generic framework and thus needs to support
// mocking any function types, including those that take non-const
// reference arguments. Therefore the template parameter T (and
// Super below) can be instantiated to either a const type or a
// non-const type.
public:
// RefMatcher() takes a T& instead of const T&, as we want the
// compiler to catch using Ref(const_value) as a matcher for a
// non-const reference.
explicit RefMatcher(T& x) : object_(x) {} // NOLINT
template <typename Super>
operator Matcher<Super&>() const {
// By passing object_ (type T&) to Impl(), which expects a Super&,
// we make sure that Super is a super type of T. In particular,
// this catches using Ref(const_value) as a matcher for a
// non-const reference, as you cannot implicitly convert a const
// reference to a non-const reference.
return MakeMatcher(new Impl<Super>(object_));
}
private:
template <typename Super>
class Impl : public MatcherInterface<Super&> {
public:
explicit Impl(Super& x) : object_(x) {} // NOLINT
// MatchAndExplain() takes a Super& (as opposed to const Super&)
// in order to match the interface MatcherInterface<Super&>.
bool MatchAndExplain(Super& x,
MatchResultListener* listener) const override {
*listener << "which is located @" << static_cast<const void*>(&x);
return &x == &object_;
}
void DescribeTo(::std::ostream* os) const override {
*os << "references the variable ";
UniversalPrinter<Super&>::Print(object_, os);
}
void DescribeNegationTo(::std::ostream* os) const override {
*os << "does not reference the variable ";
UniversalPrinter<Super&>::Print(object_, os);
}
private:
const Super& object_;
GTEST_DISALLOW_ASSIGN_(Impl);
};
T& object_;
GTEST_DISALLOW_ASSIGN_(RefMatcher);
};
// Polymorphic helper functions for narrow and wide string matchers.
inline bool CaseInsensitiveCStringEquals(const char* lhs, const char* rhs) {
return String::CaseInsensitiveCStringEquals(lhs, rhs);
}
inline bool CaseInsensitiveCStringEquals(const wchar_t* lhs,
const wchar_t* rhs) {
return String::CaseInsensitiveWideCStringEquals(lhs, rhs);
}
// String comparison for narrow or wide strings that can have embedded NUL
// characters.
template <typename StringType>
bool CaseInsensitiveStringEquals(const StringType& s1,
const StringType& s2) {
// Are the heads equal?
if (!CaseInsensitiveCStringEquals(s1.c_str(), s2.c_str())) {
return false;
}
// Skip the equal heads.
const typename StringType::value_type nul = 0;
const size_t i1 = s1.find(nul), i2 = s2.find(nul);
// Are we at the end of either s1 or s2?
if (i1 == StringType::npos || i2 == StringType::npos) {
return i1 == i2;
}
// Are the tails equal?
return CaseInsensitiveStringEquals(s1.substr(i1 + 1), s2.substr(i2 + 1));
}
// String matchers.
// Implements equality-based string matchers like StrEq, StrCaseNe, and etc.
template <typename StringType>
class StrEqualityMatcher {
public:
StrEqualityMatcher(const StringType& str, bool expect_eq,
bool case_sensitive)
: string_(str), expect_eq_(expect_eq), case_sensitive_(case_sensitive) {}
#if GTEST_HAS_ABSL
bool MatchAndExplain(const absl::string_view& s,
MatchResultListener* listener) const {
// This should fail to compile if absl::string_view is used with wide
// strings.
const StringType& str = std::string(s);
return MatchAndExplain(str, listener);
}
#endif // GTEST_HAS_ABSL
// Accepts pointer types, particularly:
// const char*
// char*
// const wchar_t*
// wchar_t*
template <typename CharType>
bool MatchAndExplain(CharType* s, MatchResultListener* listener) const {
if (s == nullptr) {
return !expect_eq_;
}
return MatchAndExplain(StringType(s), listener);
}
// Matches anything that can convert to StringType.
//
// This is a template, not just a plain function with const StringType&,
// because absl::string_view has some interfering non-explicit constructors.
template <typename MatcheeStringType>
bool MatchAndExplain(const MatcheeStringType& s,
MatchResultListener* /* listener */) const {
const StringType& s2(s);
const bool eq = case_sensitive_ ? s2 == string_ :
CaseInsensitiveStringEquals(s2, string_);
return expect_eq_ == eq;
}
void DescribeTo(::std::ostream* os) const {
DescribeToHelper(expect_eq_, os);
}
void DescribeNegationTo(::std::ostream* os) const {
DescribeToHelper(!expect_eq_, os);
}
private:
void DescribeToHelper(bool expect_eq, ::std::ostream* os) const {
*os << (expect_eq ? "is " : "isn't ");
*os << "equal to ";
if (!case_sensitive_) {
*os << "(ignoring case) ";
}
UniversalPrint(string_, os);
}
const StringType string_;
const bool expect_eq_;
const bool case_sensitive_;
GTEST_DISALLOW_ASSIGN_(StrEqualityMatcher);
};
// Implements the polymorphic HasSubstr(substring) matcher, which
// can be used as a Matcher<T> as long as T can be converted to a
// string.
template <typename StringType>
class HasSubstrMatcher {
public:
explicit HasSubstrMatcher(const StringType& substring)
: substring_(substring) {}
#if GTEST_HAS_ABSL
bool MatchAndExplain(const absl::string_view& s,
MatchResultListener* listener) const {
// This should fail to compile if absl::string_view is used with wide
// strings.
const StringType& str = std::string(s);
return MatchAndExplain(str, listener);
}
#endif // GTEST_HAS_ABSL
// Accepts pointer types, particularly:
// const char*
// char*
// const wchar_t*
// wchar_t*
template <typename CharType>
bool MatchAndExplain(CharType* s, MatchResultListener* listener) const {
return s != nullptr && MatchAndExplain(StringType(s), listener);
}
// Matches anything that can convert to StringType.
//
// This is a template, not just a plain function with const StringType&,
// because absl::string_view has some interfering non-explicit constructors.
template <typename MatcheeStringType>
bool MatchAndExplain(const MatcheeStringType& s,
MatchResultListener* /* listener */) const {
const StringType& s2(s);
return s2.find(substring_) != StringType::npos;
}
// Describes what this matcher matches.
void DescribeTo(::std::ostream* os) const {
*os << "has substring ";
UniversalPrint(substring_, os);
}
void DescribeNegationTo(::std::ostream* os) const {
*os << "has no substring ";
UniversalPrint(substring_, os);
}
private:
const StringType substring_;
GTEST_DISALLOW_ASSIGN_(HasSubstrMatcher);
};
// Implements the polymorphic StartsWith(substring) matcher, which
// can be used as a Matcher<T> as long as T can be converted to a
// string.
template <typename StringType>
class StartsWithMatcher {
public:
explicit StartsWithMatcher(const StringType& prefix) : prefix_(prefix) {
}
#if GTEST_HAS_ABSL
bool MatchAndExplain(const absl::string_view& s,
MatchResultListener* listener) const {
// This should fail to compile if absl::string_view is used with wide
// strings.
const StringType& str = std::string(s);
return MatchAndExplain(str, listener);
}
#endif // GTEST_HAS_ABSL
// Accepts pointer types, particularly:
// const char*
// char*
// const wchar_t*
// wchar_t*
template <typename CharType>
bool MatchAndExplain(CharType* s, MatchResultListener* listener) const {
return s != nullptr && MatchAndExplain(StringType(s), listener);
}
// Matches anything that can convert to StringType.
//
// This is a template, not just a plain function with const StringType&,
// because absl::string_view has some interfering non-explicit constructors.
template <typename MatcheeStringType>
bool MatchAndExplain(const MatcheeStringType& s,
MatchResultListener* /* listener */) const {
const StringType& s2(s);
return s2.length() >= prefix_.length() &&
s2.substr(0, prefix_.length()) == prefix_;
}
void DescribeTo(::std::ostream* os) const {
*os << "starts with ";
UniversalPrint(prefix_, os);
}
void DescribeNegationTo(::std::ostream* os) const {
*os << "doesn't start with ";
UniversalPrint(prefix_, os);
}
private:
const StringType prefix_;
GTEST_DISALLOW_ASSIGN_(StartsWithMatcher);
};
// Implements the polymorphic EndsWith(substring) matcher, which
// can be used as a Matcher<T> as long as T can be converted to a
// string.
template <typename StringType>
class EndsWithMatcher {
public:
explicit EndsWithMatcher(const StringType& suffix) : suffix_(suffix) {}
#if GTEST_HAS_ABSL
bool MatchAndExplain(const absl::string_view& s,
MatchResultListener* listener) const {
// This should fail to compile if absl::string_view is used with wide
// strings.
const StringType& str = std::string(s);
return MatchAndExplain(str, listener);
}
#endif // GTEST_HAS_ABSL
// Accepts pointer types, particularly:
// const char*
// char*
// const wchar_t*
// wchar_t*
template <typename CharType>
bool MatchAndExplain(CharType* s, MatchResultListener* listener) const {
return s != nullptr && MatchAndExplain(StringType(s), listener);
}
// Matches anything that can convert to StringType.
//
// This is a template, not just a plain function with const StringType&,
// because absl::string_view has some interfering non-explicit constructors.
template <typename MatcheeStringType>
bool MatchAndExplain(const MatcheeStringType& s,
MatchResultListener* /* listener */) const {
const StringType& s2(s);
return s2.length() >= suffix_.length() &&
s2.substr(s2.length() - suffix_.length()) == suffix_;
}
void DescribeTo(::std::ostream* os) const {
*os << "ends with ";
UniversalPrint(suffix_, os);
}
void DescribeNegationTo(::std::ostream* os) const {
*os << "doesn't end with ";
UniversalPrint(suffix_, os);
}
private:
const StringType suffix_;
GTEST_DISALLOW_ASSIGN_(EndsWithMatcher);
};
// Implements a matcher that compares the two fields of a 2-tuple
// using one of the ==, <=, <, etc, operators. The two fields being
// compared don't have to have the same type.
//
// The matcher defined here is polymorphic (for example, Eq() can be
// used to match a std::tuple<int, short>, a std::tuple<const long&, double>,
// etc). Therefore we use a template type conversion operator in the
// implementation.
template <typename D, typename Op>
class PairMatchBase {
public:
template <typename T1, typename T2>
operator Matcher<::std::tuple<T1, T2>>() const {
return Matcher<::std::tuple<T1, T2>>(new Impl<const ::std::tuple<T1, T2>&>);
}
template <typename T1, typename T2>
operator Matcher<const ::std::tuple<T1, T2>&>() const {
return MakeMatcher(new Impl<const ::std::tuple<T1, T2>&>);
}
private:
static ::std::ostream& GetDesc(::std::ostream& os) { // NOLINT
return os << D::Desc();
}
template <typename Tuple>
class Impl : public MatcherInterface<Tuple> {
public:
bool MatchAndExplain(Tuple args,
MatchResultListener* /* listener */) const override {
return Op()(::std::get<0>(args), ::std::get<1>(args));
}
void DescribeTo(::std::ostream* os) const override {
*os << "are " << GetDesc;
}
void DescribeNegationTo(::std::ostream* os) const override {
*os << "aren't " << GetDesc;
}
};
};
class Eq2Matcher : public PairMatchBase<Eq2Matcher, AnyEq> {
public:
static const char* Desc() { return "an equal pair"; }
};
class Ne2Matcher : public PairMatchBase<Ne2Matcher, AnyNe> {
public:
static const char* Desc() { return "an unequal pair"; }
};
class Lt2Matcher : public PairMatchBase<Lt2Matcher, AnyLt> {
public:
static const char* Desc() { return "a pair where the first < the second"; }
};
class Gt2Matcher : public PairMatchBase<Gt2Matcher, AnyGt> {
public:
static const char* Desc() { return "a pair where the first > the second"; }
};
class Le2Matcher : public PairMatchBase<Le2Matcher, AnyLe> {
public:
static const char* Desc() { return "a pair where the first <= the second"; }
};
class Ge2Matcher : public PairMatchBase<Ge2Matcher, AnyGe> {
public:
static const char* Desc() { return "a pair where the first >= the second"; }
};
// Implements the Not(...) matcher for a particular argument type T.
// We do not nest it inside the NotMatcher class template, as that
// will prevent different instantiations of NotMatcher from sharing
// the same NotMatcherImpl<T> class.
template <typename T>
class NotMatcherImpl : public MatcherInterface<const T&> {
public:
explicit NotMatcherImpl(const Matcher<T>& matcher)
: matcher_(matcher) {}
bool MatchAndExplain(const T& x,
MatchResultListener* listener) const override {
return !matcher_.MatchAndExplain(x, listener);
}
void DescribeTo(::std::ostream* os) const override {
matcher_.DescribeNegationTo(os);
}
void DescribeNegationTo(::std::ostream* os) const override {
matcher_.DescribeTo(os);
}
private:
const Matcher<T> matcher_;
GTEST_DISALLOW_ASSIGN_(NotMatcherImpl);
};
// Implements the Not(m) matcher, which matches a value that doesn't
// match matcher m.
template <typename InnerMatcher>
class NotMatcher {
public:
explicit NotMatcher(InnerMatcher matcher) : matcher_(matcher) {}
// This template type conversion operator allows Not(m) to be used
// to match any type m can match.
template <typename T>
operator Matcher<T>() const {
return Matcher<T>(new NotMatcherImpl<T>(SafeMatcherCast<T>(matcher_)));
}
private:
InnerMatcher matcher_;
GTEST_DISALLOW_ASSIGN_(NotMatcher);
};
// Implements the AllOf(m1, m2) matcher for a particular argument type
// T. We do not nest it inside the BothOfMatcher class template, as
// that will prevent different instantiations of BothOfMatcher from
// sharing the same BothOfMatcherImpl<T> class.
template <typename T>
class AllOfMatcherImpl : public MatcherInterface<const T&> {
public:
explicit AllOfMatcherImpl(std::vector<Matcher<T> > matchers)
: matchers_(std::move(matchers)) {}
void DescribeTo(::std::ostream* os) const override {
*os << "(";
for (size_t i = 0; i < matchers_.size(); ++i) {
if (i != 0) *os << ") and (";
matchers_[i].DescribeTo(os);
}
*os << ")";
}
void DescribeNegationTo(::std::ostream* os) const override {
*os << "(";
for (size_t i = 0; i < matchers_.size(); ++i) {
if (i != 0) *os << ") or (";
matchers_[i].DescribeNegationTo(os);
}
*os << ")";
}
bool MatchAndExplain(const T& x,
MatchResultListener* listener) const override {
// If either matcher1_ or matcher2_ doesn't match x, we only need
// to explain why one of them fails.
std::string all_match_result;
for (size_t i = 0; i < matchers_.size(); ++i) {
StringMatchResultListener slistener;
if (matchers_[i].MatchAndExplain(x, &slistener)) {
if (all_match_result.empty()) {
all_match_result = slistener.str();
} else {
std::string result = slistener.str();
if (!result.empty()) {
all_match_result += ", and ";
all_match_result += result;
}
}
} else {
*listener << slistener.str();
return false;
}
}
// Otherwise we need to explain why *both* of them match.
*listener << all_match_result;
return true;
}
private:
const std::vector<Matcher<T> > matchers_;
GTEST_DISALLOW_ASSIGN_(AllOfMatcherImpl);
};
// VariadicMatcher is used for the variadic implementation of
// AllOf(m_1, m_2, ...) and AnyOf(m_1, m_2, ...).
// CombiningMatcher<T> is used to recursively combine the provided matchers
// (of type Args...).
template <template <typename T> class CombiningMatcher, typename... Args>
class VariadicMatcher {
public:
VariadicMatcher(const Args&... matchers) // NOLINT
: matchers_(matchers...) {
static_assert(sizeof...(Args) > 0, "Must have at least one matcher.");
}
// This template type conversion operator allows an
// VariadicMatcher<Matcher1, Matcher2...> object to match any type that
// all of the provided matchers (Matcher1, Matcher2, ...) can match.
template <typename T>
operator Matcher<T>() const {
std::vector<Matcher<T> > values;
CreateVariadicMatcher<T>(&values, std::integral_constant<size_t, 0>());
return Matcher<T>(new CombiningMatcher<T>(std::move(values)));
}
private:
template <typename T, size_t I>
void CreateVariadicMatcher(std::vector<Matcher<T> >* values,
std::integral_constant<size_t, I>) const {
values->push_back(SafeMatcherCast<T>(std::get<I>(matchers_)));
CreateVariadicMatcher<T>(values, std::integral_constant<size_t, I + 1>());
}
template <typename T>
void CreateVariadicMatcher(
std::vector<Matcher<T> >*,
std::integral_constant<size_t, sizeof...(Args)>) const {}
std::tuple<Args...> matchers_;
GTEST_DISALLOW_ASSIGN_(VariadicMatcher);
};
template <typename... Args>
using AllOfMatcher = VariadicMatcher<AllOfMatcherImpl, Args...>;
// Implements the AnyOf(m1, m2) matcher for a particular argument type
// T. We do not nest it inside the AnyOfMatcher class template, as
// that will prevent different instantiations of AnyOfMatcher from
// sharing the same EitherOfMatcherImpl<T> class.
template <typename T>
class AnyOfMatcherImpl : public MatcherInterface<const T&> {
public:
explicit AnyOfMatcherImpl(std::vector<Matcher<T> > matchers)
: matchers_(std::move(matchers)) {}
void DescribeTo(::std::ostream* os) const override {
*os << "(";
for (size_t i = 0; i < matchers_.size(); ++i) {
if (i != 0) *os << ") or (";
matchers_[i].DescribeTo(os);
}
*os << ")";
}
void DescribeNegationTo(::std::ostream* os) const override {
*os << "(";
for (size_t i = 0; i < matchers_.size(); ++i) {
if (i != 0) *os << ") and (";
matchers_[i].DescribeNegationTo(os);
}
*os << ")";
}
bool MatchAndExplain(const T& x,
MatchResultListener* listener) const override {
std::string no_match_result;
// If either matcher1_ or matcher2_ matches x, we just need to
// explain why *one* of them matches.
for (size_t i = 0; i < matchers_.size(); ++i) {
StringMatchResultListener slistener;
if (matchers_[i].MatchAndExplain(x, &slistener)) {
*listener << slistener.str();
return true;
} else {
if (no_match_result.empty()) {
no_match_result = slistener.str();
} else {
std::string result = slistener.str();
if (!result.empty()) {
no_match_result += ", and ";
no_match_result += result;
}
}
}
}
// Otherwise we need to explain why *both* of them fail.
*listener << no_match_result;
return false;
}
private:
const std::vector<Matcher<T> > matchers_;
GTEST_DISALLOW_ASSIGN_(AnyOfMatcherImpl);
};
// AnyOfMatcher is used for the variadic implementation of AnyOf(m_1, m_2, ...).
template <typename... Args>
using AnyOfMatcher = VariadicMatcher<AnyOfMatcherImpl, Args...>;
// Wrapper for implementation of Any/AllOfArray().
template <template <class> class MatcherImpl, typename T>
class SomeOfArrayMatcher {
public:
// Constructs the matcher from a sequence of element values or
// element matchers.
template <typename Iter>
SomeOfArrayMatcher(Iter first, Iter last) : matchers_(first, last) {}
template <typename U>
operator Matcher<U>() const { // NOLINT
using RawU = typename std::decay<U>::type;
std::vector<Matcher<RawU>> matchers;
for (const auto& matcher : matchers_) {
matchers.push_back(MatcherCast<RawU>(matcher));
}
return Matcher<U>(new MatcherImpl<RawU>(std::move(matchers)));
}
private:
const ::std::vector<T> matchers_;
GTEST_DISALLOW_ASSIGN_(SomeOfArrayMatcher);
};
template <typename T>
using AllOfArrayMatcher = SomeOfArrayMatcher<AllOfMatcherImpl, T>;
template <typename T>
using AnyOfArrayMatcher = SomeOfArrayMatcher<AnyOfMatcherImpl, T>;
// Used for implementing Truly(pred), which turns a predicate into a
// matcher.
template <typename Predicate>
class TrulyMatcher {
public:
explicit TrulyMatcher(Predicate pred) : predicate_(pred) {}
// This method template allows Truly(pred) to be used as a matcher
// for type T where T is the argument type of predicate 'pred'. The
// argument is passed by reference as the predicate may be
// interested in the address of the argument.
template <typename T>
bool MatchAndExplain(T& x, // NOLINT
MatchResultListener* /* listener */) const {
// Without the if-statement, MSVC sometimes warns about converting
// a value to bool (warning 4800).
//
// We cannot write 'return !!predicate_(x);' as that doesn't work
// when predicate_(x) returns a class convertible to bool but
// having no operator!().
if (predicate_(x))
return true;
return false;
}
void DescribeTo(::std::ostream* os) const {
*os << "satisfies the given predicate";
}
void DescribeNegationTo(::std::ostream* os) const {
*os << "doesn't satisfy the given predicate";
}
private:
Predicate predicate_;
GTEST_DISALLOW_ASSIGN_(TrulyMatcher);
};
// Used for implementing Matches(matcher), which turns a matcher into
// a predicate.
template <typename M>
class MatcherAsPredicate {
public:
explicit MatcherAsPredicate(M matcher) : matcher_(matcher) {}
// This template operator() allows Matches(m) to be used as a
// predicate on type T where m is a matcher on type T.
//
// The argument x is passed by reference instead of by value, as
// some matcher may be interested in its address (e.g. as in
// Matches(Ref(n))(x)).
template <typename T>
bool operator()(const T& x) const {
// We let matcher_ commit to a particular type here instead of
// when the MatcherAsPredicate object was constructed. This
// allows us to write Matches(m) where m is a polymorphic matcher
// (e.g. Eq(5)).
//
// If we write Matcher<T>(matcher_).Matches(x) here, it won't
// compile when matcher_ has type Matcher<const T&>; if we write
// Matcher<const T&>(matcher_).Matches(x) here, it won't compile
// when matcher_ has type Matcher<T>; if we just write
// matcher_.Matches(x), it won't compile when matcher_ is
// polymorphic, e.g. Eq(5).
//
// MatcherCast<const T&>() is necessary for making the code work
// in all of the above situations.
return MatcherCast<const T&>(matcher_).Matches(x);
}
private:
M matcher_;
GTEST_DISALLOW_ASSIGN_(MatcherAsPredicate);
};
// For implementing ASSERT_THAT() and EXPECT_THAT(). The template
// argument M must be a type that can be converted to a matcher.
template <typename M>
class PredicateFormatterFromMatcher {
public:
explicit PredicateFormatterFromMatcher(M m) : matcher_(std::move(m)) {}
// This template () operator allows a PredicateFormatterFromMatcher
// object to act as a predicate-formatter suitable for using with
// Google Test's EXPECT_PRED_FORMAT1() macro.
template <typename T>
AssertionResult operator()(const char* value_text, const T& x) const {
// We convert matcher_ to a Matcher<const T&> *now* instead of
// when the PredicateFormatterFromMatcher object was constructed,
// as matcher_ may be polymorphic (e.g. NotNull()) and we won't
// know which type to instantiate it to until we actually see the
// type of x here.
//
// We write SafeMatcherCast<const T&>(matcher_) instead of
// Matcher<const T&>(matcher_), as the latter won't compile when
// matcher_ has type Matcher<T> (e.g. An<int>()).
// We don't write MatcherCast<const T&> either, as that allows
// potentially unsafe downcasting of the matcher argument.
const Matcher<const T&> matcher = SafeMatcherCast<const T&>(matcher_);
// The expected path here is that the matcher should match (i.e. that most
// tests pass) so optimize for this case.
if (matcher.Matches(x)) {
return AssertionSuccess();
}
::std::stringstream ss;
ss << "Value of: " << value_text << "\n"
<< "Expected: ";
matcher.DescribeTo(&ss);
// Rerun the matcher to "PrintAndExain" the failure.
StringMatchResultListener listener;
if (MatchPrintAndExplain(x, matcher, &listener)) {
ss << "\n The matcher failed on the initial attempt; but passed when "
"rerun to generate the explanation.";
}
ss << "\n Actual: " << listener.str();
return AssertionFailure() << ss.str();
}
private:
const M matcher_;
GTEST_DISALLOW_ASSIGN_(PredicateFormatterFromMatcher);
};
// A helper function for converting a matcher to a predicate-formatter
// without the user needing to explicitly write the type. This is
// used for implementing ASSERT_THAT() and EXPECT_THAT().
// Implementation detail: 'matcher' is received by-value to force decaying.
template <typename M>
inline PredicateFormatterFromMatcher<M>
MakePredicateFormatterFromMatcher(M matcher) {
return PredicateFormatterFromMatcher<M>(std::move(matcher));
}
// Implements the polymorphic floating point equality matcher, which matches
// two float values using ULP-based approximation or, optionally, a
// user-specified epsilon. The template is meant to be instantiated with
// FloatType being either float or double.
template <typename FloatType>
class FloatingEqMatcher {
public:
// Constructor for FloatingEqMatcher.
// The matcher's input will be compared with expected. The matcher treats two
// NANs as equal if nan_eq_nan is true. Otherwise, under IEEE standards,
// equality comparisons between NANs will always return false. We specify a
// negative max_abs_error_ term to indicate that ULP-based approximation will
// be used for comparison.
FloatingEqMatcher(FloatType expected, bool nan_eq_nan) :
expected_(expected), nan_eq_nan_(nan_eq_nan), max_abs_error_(-1) {
}
// Constructor that supports a user-specified max_abs_error that will be used
// for comparison instead of ULP-based approximation. The max absolute
// should be non-negative.
FloatingEqMatcher(FloatType expected, bool nan_eq_nan,
FloatType max_abs_error)
: expected_(expected),
nan_eq_nan_(nan_eq_nan),
max_abs_error_(max_abs_error) {
GTEST_CHECK_(max_abs_error >= 0)
<< ", where max_abs_error is" << max_abs_error;
}
// Implements floating point equality matcher as a Matcher<T>.
template <typename T>
class Impl : public MatcherInterface<T> {
public:
Impl(FloatType expected, bool nan_eq_nan, FloatType max_abs_error)
: expected_(expected),
nan_eq_nan_(nan_eq_nan),
max_abs_error_(max_abs_error) {}
bool MatchAndExplain(T value,
MatchResultListener* listener) const override {
const FloatingPoint<FloatType> actual(value), expected(expected_);
// Compares NaNs first, if nan_eq_nan_ is true.
if (actual.is_nan() || expected.is_nan()) {
if (actual.is_nan() && expected.is_nan()) {
return nan_eq_nan_;
}
// One is nan; the other is not nan.
return false;
}
if (HasMaxAbsError()) {
// We perform an equality check so that inf will match inf, regardless
// of error bounds. If the result of value - expected_ would result in
// overflow or if either value is inf, the default result is infinity,
// which should only match if max_abs_error_ is also infinity.
if (value == expected_) {
return true;
}
const FloatType diff = value - expected_;
if (fabs(diff) <= max_abs_error_) {
return true;
}
if (listener->IsInterested()) {
*listener << "which is " << diff << " from " << expected_;
}
return false;
} else {
return actual.AlmostEquals(expected);
}
}
void DescribeTo(::std::ostream* os) const override {
// os->precision() returns the previously set precision, which we
// store to restore the ostream to its original configuration
// after outputting.
const ::std::streamsize old_precision = os->precision(
::std::numeric_limits<FloatType>::digits10 + 2);
if (FloatingPoint<FloatType>(expected_).is_nan()) {
if (nan_eq_nan_) {
*os << "is NaN";
} else {
*os << "never matches";
}
} else {
*os << "is approximately " << expected_;
if (HasMaxAbsError()) {
*os << " (absolute error <= " << max_abs_error_ << ")";
}
}
os->precision(old_precision);
}
void DescribeNegationTo(::std::ostream* os) const override {
// As before, get original precision.
const ::std::streamsize old_precision = os->precision(
::std::numeric_limits<FloatType>::digits10 + 2);
if (FloatingPoint<FloatType>(expected_).is_nan()) {
if (nan_eq_nan_) {
*os << "isn't NaN";
} else {
*os << "is anything";
}
} else {
*os << "isn't approximately " << expected_;
if (HasMaxAbsError()) {
*os << " (absolute error > " << max_abs_error_ << ")";
}
}
// Restore original precision.
os->precision(old_precision);
}
private:
bool HasMaxAbsError() const {
return max_abs_error_ >= 0;
}
const FloatType expected_;
const bool nan_eq_nan_;
// max_abs_error will be used for value comparison when >= 0.
const FloatType max_abs_error_;
GTEST_DISALLOW_ASSIGN_(Impl);
};
// The following 3 type conversion operators allow FloatEq(expected) and
// NanSensitiveFloatEq(expected) to be used as a Matcher<float>, a
// Matcher<const float&>, or a Matcher<float&>, but nothing else.
// (While Google's C++ coding style doesn't allow arguments passed
// by non-const reference, we may see them in code not conforming to
// the style. Therefore Google Mock needs to support them.)
operator Matcher<FloatType>() const {
return MakeMatcher(
new Impl<FloatType>(expected_, nan_eq_nan_, max_abs_error_));
}
operator Matcher<const FloatType&>() const {
return MakeMatcher(
new Impl<const FloatType&>(expected_, nan_eq_nan_, max_abs_error_));
}
operator Matcher<FloatType&>() const {
return MakeMatcher(
new Impl<FloatType&>(expected_, nan_eq_nan_, max_abs_error_));
}
private:
const FloatType expected_;
const bool nan_eq_nan_;
// max_abs_error will be used for value comparison when >= 0.
const FloatType max_abs_error_;
GTEST_DISALLOW_ASSIGN_(FloatingEqMatcher);
};
// A 2-tuple ("binary") wrapper around FloatingEqMatcher:
// FloatingEq2Matcher() matches (x, y) by matching FloatingEqMatcher(x, false)
// against y, and FloatingEq2Matcher(e) matches FloatingEqMatcher(x, false, e)
// against y. The former implements "Eq", the latter "Near". At present, there
// is no version that compares NaNs as equal.
template <typename FloatType>
class FloatingEq2Matcher {
public:
FloatingEq2Matcher() { Init(-1, false); }
explicit FloatingEq2Matcher(bool nan_eq_nan) { Init(-1, nan_eq_nan); }
explicit FloatingEq2Matcher(FloatType max_abs_error) {
Init(max_abs_error, false);
}
FloatingEq2Matcher(FloatType max_abs_error, bool nan_eq_nan) {
Init(max_abs_error, nan_eq_nan);
}
template <typename T1, typename T2>
operator Matcher<::std::tuple<T1, T2>>() const {
return MakeMatcher(
new Impl<::std::tuple<T1, T2>>(max_abs_error_, nan_eq_nan_));
}
template <typename T1, typename T2>
operator Matcher<const ::std::tuple<T1, T2>&>() const {
return MakeMatcher(
new Impl<const ::std::tuple<T1, T2>&>(max_abs_error_, nan_eq_nan_));
}
private:
static ::std::ostream& GetDesc(::std::ostream& os) { // NOLINT
return os << "an almost-equal pair";
}
template <typename Tuple>
class Impl : public MatcherInterface<Tuple> {
public:
Impl(FloatType max_abs_error, bool nan_eq_nan) :
max_abs_error_(max_abs_error),
nan_eq_nan_(nan_eq_nan) {}
bool MatchAndExplain(Tuple args,
MatchResultListener* listener) const override {
if (max_abs_error_ == -1) {
FloatingEqMatcher<FloatType> fm(::std::get<0>(args), nan_eq_nan_);
return static_cast<Matcher<FloatType>>(fm).MatchAndExplain(
::std::get<1>(args), listener);
} else {
FloatingEqMatcher<FloatType> fm(::std::get<0>(args), nan_eq_nan_,
max_abs_error_);
return static_cast<Matcher<FloatType>>(fm).MatchAndExplain(
::std::get<1>(args), listener);
}
}
void DescribeTo(::std::ostream* os) const override {
*os << "are " << GetDesc;
}
void DescribeNegationTo(::std::ostream* os) const override {
*os << "aren't " << GetDesc;
}
private:
FloatType max_abs_error_;
const bool nan_eq_nan_;
};
void Init(FloatType max_abs_error_val, bool nan_eq_nan_val) {
max_abs_error_ = max_abs_error_val;
nan_eq_nan_ = nan_eq_nan_val;
}
FloatType max_abs_error_;
bool nan_eq_nan_;
};
// Implements the Pointee(m) matcher for matching a pointer whose
// pointee matches matcher m. The pointer can be either raw or smart.
template <typename InnerMatcher>
class PointeeMatcher {
public:
explicit PointeeMatcher(const InnerMatcher& matcher) : matcher_(matcher) {}
// This type conversion operator template allows Pointee(m) to be
// used as a matcher for any pointer type whose pointee type is
// compatible with the inner matcher, where type Pointer can be
// either a raw pointer or a smart pointer.
//
// The reason we do this instead of relying on
// MakePolymorphicMatcher() is that the latter is not flexible
// enough for implementing the DescribeTo() method of Pointee().
template <typename Pointer>
operator Matcher<Pointer>() const {
return Matcher<Pointer>(new Impl<const Pointer&>(matcher_));
}
private:
// The monomorphic implementation that works for a particular pointer type.
template <typename Pointer>
class Impl : public MatcherInterface<Pointer> {
public:
typedef
typename PointeeOf<typename std::remove_const<GTEST_REMOVE_REFERENCE_(
Pointer)>::type>::type Pointee;
explicit Impl(const InnerMatcher& matcher)
: matcher_(MatcherCast<const Pointee&>(matcher)) {}
void DescribeTo(::std::ostream* os) const override {
*os << "points to a value that ";
matcher_.DescribeTo(os);
}
void DescribeNegationTo(::std::ostream* os) const override {
*os << "does not point to a value that ";
matcher_.DescribeTo(os);
}
bool MatchAndExplain(Pointer pointer,
MatchResultListener* listener) const override {
if (GetRawPointer(pointer) == nullptr) return false;
*listener << "which points to ";
return MatchPrintAndExplain(*pointer, matcher_, listener);
}
private:
const Matcher<const Pointee&> matcher_;
GTEST_DISALLOW_ASSIGN_(Impl);
};
const InnerMatcher matcher_;
GTEST_DISALLOW_ASSIGN_(PointeeMatcher);
};
#if GTEST_HAS_RTTI
// Implements the WhenDynamicCastTo<T>(m) matcher that matches a pointer or
// reference that matches inner_matcher when dynamic_cast<T> is applied.
// The result of dynamic_cast<To> is forwarded to the inner matcher.
// If To is a pointer and the cast fails, the inner matcher will receive NULL.
// If To is a reference and the cast fails, this matcher returns false
// immediately.
template <typename To>
class WhenDynamicCastToMatcherBase {
public:
explicit WhenDynamicCastToMatcherBase(const Matcher<To>& matcher)
: matcher_(matcher) {}
void DescribeTo(::std::ostream* os) const {
GetCastTypeDescription(os);
matcher_.DescribeTo(os);
}
void DescribeNegationTo(::std::ostream* os) const {
GetCastTypeDescription(os);
matcher_.DescribeNegationTo(os);
}
protected:
const Matcher<To> matcher_;
static std::string GetToName() {
return GetTypeName<To>();
}
private:
static void GetCastTypeDescription(::std::ostream* os) {
*os << "when dynamic_cast to " << GetToName() << ", ";
}
GTEST_DISALLOW_ASSIGN_(WhenDynamicCastToMatcherBase);
};
// Primary template.
// To is a pointer. Cast and forward the result.
template <typename To>
class WhenDynamicCastToMatcher : public WhenDynamicCastToMatcherBase<To> {
public:
explicit WhenDynamicCastToMatcher(const Matcher<To>& matcher)
: WhenDynamicCastToMatcherBase<To>(matcher) {}
template <typename From>
bool MatchAndExplain(From from, MatchResultListener* listener) const {
To to = dynamic_cast<To>(from);
return MatchPrintAndExplain(to, this->matcher_, listener);
}
};
// Specialize for references.
// In this case we return false if the dynamic_cast fails.
template <typename To>
class WhenDynamicCastToMatcher<To&> : public WhenDynamicCastToMatcherBase<To&> {
public:
explicit WhenDynamicCastToMatcher(const Matcher<To&>& matcher)
: WhenDynamicCastToMatcherBase<To&>(matcher) {}
template <typename From>
bool MatchAndExplain(From& from, MatchResultListener* listener) const {
// We don't want an std::bad_cast here, so do the cast with pointers.
To* to = dynamic_cast<To*>(&from);
if (to == nullptr) {
*listener << "which cannot be dynamic_cast to " << this->GetToName();
return false;
}
return MatchPrintAndExplain(*to, this->matcher_, listener);
}
};
#endif // GTEST_HAS_RTTI
// Implements the Field() matcher for matching a field (i.e. member
// variable) of an object.
template <typename Class, typename FieldType>
class FieldMatcher {
public:
FieldMatcher(FieldType Class::*field,
const Matcher<const FieldType&>& matcher)
: field_(field), matcher_(matcher), whose_field_("whose given field ") {}
FieldMatcher(const std::string& field_name, FieldType Class::*field,
const Matcher<const FieldType&>& matcher)
: field_(field),
matcher_(matcher),
whose_field_("whose field `" + field_name + "` ") {}
void DescribeTo(::std::ostream* os) const {
*os << "is an object " << whose_field_;
matcher_.DescribeTo(os);
}
void DescribeNegationTo(::std::ostream* os) const {
*os << "is an object " << whose_field_;
matcher_.DescribeNegationTo(os);
}
template <typename T>
bool MatchAndExplain(const T& value, MatchResultListener* listener) const {
// FIXME: The dispatch on std::is_pointer was introduced as a workaround for
// a compiler bug, and can now be removed.
return MatchAndExplainImpl(
typename std::is_pointer<typename std::remove_const<T>::type>::type(),
value, listener);
}
private:
bool MatchAndExplainImpl(std::false_type /* is_not_pointer */,
const Class& obj,
MatchResultListener* listener) const {
*listener << whose_field_ << "is ";
return MatchPrintAndExplain(obj.*field_, matcher_, listener);
}
bool MatchAndExplainImpl(std::true_type /* is_pointer */, const Class* p,
MatchResultListener* listener) const {
if (p == nullptr) return false;
*listener << "which points to an object ";
// Since *p has a field, it must be a class/struct/union type and
// thus cannot be a pointer. Therefore we pass false_type() as
// the first argument.
return MatchAndExplainImpl(std::false_type(), *p, listener);
}
const FieldType Class::*field_;
const Matcher<const FieldType&> matcher_;
// Contains either "whose given field " if the name of the field is unknown
// or "whose field `name_of_field` " if the name is known.
const std::string whose_field_;
GTEST_DISALLOW_ASSIGN_(FieldMatcher);
};
// Implements the Property() matcher for matching a property
// (i.e. return value of a getter method) of an object.
//
// Property is a const-qualified member function of Class returning
// PropertyType.
template <typename Class, typename PropertyType, typename Property>
class PropertyMatcher {
public:
typedef const PropertyType& RefToConstProperty;
PropertyMatcher(Property property, const Matcher<RefToConstProperty>& matcher)
: property_(property),
matcher_(matcher),
whose_property_("whose given property ") {}
PropertyMatcher(const std::string& property_name, Property property,
const Matcher<RefToConstProperty>& matcher)
: property_(property),
matcher_(matcher),
whose_property_("whose property `" + property_name + "` ") {}
void DescribeTo(::std::ostream* os) const {
*os << "is an object " << whose_property_;
matcher_.DescribeTo(os);
}
void DescribeNegationTo(::std::ostream* os) const {
*os << "is an object " << whose_property_;
matcher_.DescribeNegationTo(os);
}
template <typename T>
bool MatchAndExplain(const T&value, MatchResultListener* listener) const {
return MatchAndExplainImpl(
typename std::is_pointer<typename std::remove_const<T>::type>::type(),
value, listener);
}
private:
bool MatchAndExplainImpl(std::false_type /* is_not_pointer */,
const Class& obj,
MatchResultListener* listener) const {
*listener << whose_property_ << "is ";
// Cannot pass the return value (for example, int) to MatchPrintAndExplain,
// which takes a non-const reference as argument.
RefToConstProperty result = (obj.*property_)();
return MatchPrintAndExplain(result, matcher_, listener);
}
bool MatchAndExplainImpl(std::true_type /* is_pointer */, const Class* p,
MatchResultListener* listener) const {
if (p == nullptr) return false;
*listener << "which points to an object ";
// Since *p has a property method, it must be a class/struct/union
// type and thus cannot be a pointer. Therefore we pass
// false_type() as the first argument.
return MatchAndExplainImpl(std::false_type(), *p, listener);
}
Property property_;
const Matcher<RefToConstProperty> matcher_;
// Contains either "whose given property " if the name of the property is
// unknown or "whose property `name_of_property` " if the name is known.
const std::string whose_property_;
GTEST_DISALLOW_ASSIGN_(PropertyMatcher);
};
// Type traits specifying various features of different functors for ResultOf.
// The default template specifies features for functor objects.
template <typename Functor>
struct CallableTraits {
typedef Functor StorageType;
static void CheckIsValid(Functor /* functor */) {}
template <typename T>
static auto Invoke(Functor f, T arg) -> decltype(f(arg)) { return f(arg); }
};
// Specialization for function pointers.
template <typename ArgType, typename ResType>
struct CallableTraits<ResType(*)(ArgType)> {
typedef ResType ResultType;
typedef ResType(*StorageType)(ArgType);
static void CheckIsValid(ResType(*f)(ArgType)) {
GTEST_CHECK_(f != nullptr)
<< "NULL function pointer is passed into ResultOf().";
}
template <typename T>
static ResType Invoke(ResType(*f)(ArgType), T arg) {
return (*f)(arg);
}
};
// Implements the ResultOf() matcher for matching a return value of a
// unary function of an object.
template <typename Callable, typename InnerMatcher>
class ResultOfMatcher {
public:
ResultOfMatcher(Callable callable, InnerMatcher matcher)
: callable_(std::move(callable)), matcher_(std::move(matcher)) {
CallableTraits<Callable>::CheckIsValid(callable_);
}
template <typename T>
operator Matcher<T>() const {
return Matcher<T>(new Impl<T>(callable_, matcher_));
}
private:
typedef typename CallableTraits<Callable>::StorageType CallableStorageType;
template <typename T>
class Impl : public MatcherInterface<T> {
using ResultType = decltype(CallableTraits<Callable>::template Invoke<T>(
std::declval<CallableStorageType>(), std::declval<T>()));
public:
template <typename M>
Impl(const CallableStorageType& callable, const M& matcher)
: callable_(callable), matcher_(MatcherCast<ResultType>(matcher)) {}
void DescribeTo(::std::ostream* os) const override {
*os << "is mapped by the given callable to a value that ";
matcher_.DescribeTo(os);
}
void DescribeNegationTo(::std::ostream* os) const override {
*os << "is mapped by the given callable to a value that ";
matcher_.DescribeNegationTo(os);
}
bool MatchAndExplain(T obj, MatchResultListener* listener) const override {
*listener << "which is mapped by the given callable to ";
// Cannot pass the return value directly to MatchPrintAndExplain, which
// takes a non-const reference as argument.
// Also, specifying template argument explicitly is needed because T could
// be a non-const reference (e.g. Matcher<Uncopyable&>).
ResultType result =
CallableTraits<Callable>::template Invoke<T>(callable_, obj);
return MatchPrintAndExplain(result, matcher_, listener);
}
private:
// Functors often define operator() as non-const method even though
// they are actually stateless. But we need to use them even when
// 'this' is a const pointer. It's the user's responsibility not to
// use stateful callables with ResultOf(), which doesn't guarantee
// how many times the callable will be invoked.
mutable CallableStorageType callable_;
const Matcher<ResultType> matcher_;
GTEST_DISALLOW_ASSIGN_(Impl);
}; // class Impl
const CallableStorageType callable_;
const InnerMatcher matcher_;
GTEST_DISALLOW_ASSIGN_(ResultOfMatcher);
};
// Implements a matcher that checks the size of an STL-style container.
template <typename SizeMatcher>
class SizeIsMatcher {
public:
explicit SizeIsMatcher(const SizeMatcher& size_matcher)
: size_matcher_(size_matcher) {
}
template <typename Container>
operator Matcher<Container>() const {
return Matcher<Container>(new Impl<const Container&>(size_matcher_));
}
template <typename Container>
class Impl : public MatcherInterface<Container> {
public:
using SizeType = decltype(std::declval<Container>().size());
explicit Impl(const SizeMatcher& size_matcher)
: size_matcher_(MatcherCast<SizeType>(size_matcher)) {}
void DescribeTo(::std::ostream* os) const override {
*os << "size ";
size_matcher_.DescribeTo(os);
}
void DescribeNegationTo(::std::ostream* os) const override {
*os << "size ";
size_matcher_.DescribeNegationTo(os);
}
bool MatchAndExplain(Container container,
MatchResultListener* listener) const override {
SizeType size = container.size();
StringMatchResultListener size_listener;
const bool result = size_matcher_.MatchAndExplain(size, &size_listener);
*listener
<< "whose size " << size << (result ? " matches" : " doesn't match");
PrintIfNotEmpty(size_listener.str(), listener->stream());
return result;
}
private:
const Matcher<SizeType> size_matcher_;
GTEST_DISALLOW_ASSIGN_(Impl);
};
private:
const SizeMatcher size_matcher_;
GTEST_DISALLOW_ASSIGN_(SizeIsMatcher);
};
// Implements a matcher that checks the begin()..end() distance of an STL-style
// container.
template <typename DistanceMatcher>
class BeginEndDistanceIsMatcher {
public:
explicit BeginEndDistanceIsMatcher(const DistanceMatcher& distance_matcher)
: distance_matcher_(distance_matcher) {}
template <typename Container>
operator Matcher<Container>() const {
return Matcher<Container>(new Impl<const Container&>(distance_matcher_));
}
template <typename Container>
class Impl : public MatcherInterface<Container> {
public:
typedef internal::StlContainerView<
GTEST_REMOVE_REFERENCE_AND_CONST_(Container)> ContainerView;
typedef typename std::iterator_traits<
typename ContainerView::type::const_iterator>::difference_type
DistanceType;
explicit Impl(const DistanceMatcher& distance_matcher)
: distance_matcher_(MatcherCast<DistanceType>(distance_matcher)) {}
void DescribeTo(::std::ostream* os) const override {
*os << "distance between begin() and end() ";
distance_matcher_.DescribeTo(os);
}
void DescribeNegationTo(::std::ostream* os) const override {
*os << "distance between begin() and end() ";
distance_matcher_.DescribeNegationTo(os);
}
bool MatchAndExplain(Container container,
MatchResultListener* listener) const override {
using std::begin;
using std::end;
DistanceType distance = std::distance(begin(container), end(container));
StringMatchResultListener distance_listener;
const bool result =
distance_matcher_.MatchAndExplain(distance, &distance_listener);
*listener << "whose distance between begin() and end() " << distance
<< (result ? " matches" : " doesn't match");
PrintIfNotEmpty(distance_listener.str(), listener->stream());
return result;
}
private:
const Matcher<DistanceType> distance_matcher_;
GTEST_DISALLOW_ASSIGN_(Impl);
};
private:
const DistanceMatcher distance_matcher_;
GTEST_DISALLOW_ASSIGN_(BeginEndDistanceIsMatcher);
};
// Implements an equality matcher for any STL-style container whose elements
// support ==. This matcher is like Eq(), but its failure explanations provide
// more detailed information that is useful when the container is used as a set.
// The failure message reports elements that are in one of the operands but not
// the other. The failure messages do not report duplicate or out-of-order
// elements in the containers (which don't properly matter to sets, but can
// occur if the containers are vectors or lists, for example).
//
// Uses the container's const_iterator, value_type, operator ==,
// begin(), and end().
template <typename Container>
class ContainerEqMatcher {
public:
typedef internal::StlContainerView<Container> View;
typedef typename View::type StlContainer;
typedef typename View::const_reference StlContainerReference;
// We make a copy of expected in case the elements in it are modified
// after this matcher is created.
explicit ContainerEqMatcher(const Container& expected)
: expected_(View::Copy(expected)) {
// Makes sure the user doesn't instantiate this class template
// with a const or reference type.
(void)testing::StaticAssertTypeEq<Container,
GTEST_REMOVE_REFERENCE_AND_CONST_(Container)>();
}
void DescribeTo(::std::ostream* os) const {
*os << "equals ";
UniversalPrint(expected_, os);
}
void DescribeNegationTo(::std::ostream* os) const {
*os << "does not equal ";
UniversalPrint(expected_, os);
}
template <typename LhsContainer>
bool MatchAndExplain(const LhsContainer& lhs,
MatchResultListener* listener) const {
typedef internal::StlContainerView<
typename std::remove_const<LhsContainer>::type>
LhsView;
typedef typename LhsView::type LhsStlContainer;
StlContainerReference lhs_stl_container = LhsView::ConstReference(lhs);
if (lhs_stl_container == expected_)
return true;
::std::ostream* const os = listener->stream();
if (os != nullptr) {
// Something is different. Check for extra values first.
bool printed_header = false;
for (typename LhsStlContainer::const_iterator it =
lhs_stl_container.begin();
it != lhs_stl_container.end(); ++it) {
if (internal::ArrayAwareFind(expected_.begin(), expected_.end(), *it) ==
expected_.end()) {
if (printed_header) {
*os << ", ";
} else {
*os << "which has these unexpected elements: ";
printed_header = true;
}
UniversalPrint(*it, os);
}
}
// Now check for missing values.
bool printed_header2 = false;
for (typename StlContainer::const_iterator it = expected_.begin();
it != expected_.end(); ++it) {
if (internal::ArrayAwareFind(
lhs_stl_container.begin(), lhs_stl_container.end(), *it) ==
lhs_stl_container.end()) {
if (printed_header2) {
*os << ", ";
} else {
*os << (printed_header ? ",\nand" : "which")
<< " doesn't have these expected elements: ";
printed_header2 = true;
}
UniversalPrint(*it, os);
}
}
}
return false;
}
private:
const StlContainer expected_;
GTEST_DISALLOW_ASSIGN_(ContainerEqMatcher);
};
// A comparator functor that uses the < operator to compare two values.
struct LessComparator {
template <typename T, typename U>
bool operator()(const T& lhs, const U& rhs) const { return lhs < rhs; }
};
// Implements WhenSortedBy(comparator, container_matcher).
template <typename Comparator, typename ContainerMatcher>
class WhenSortedByMatcher {
public:
WhenSortedByMatcher(const Comparator& comparator,
const ContainerMatcher& matcher)
: comparator_(comparator), matcher_(matcher) {}
template <typename LhsContainer>
operator Matcher<LhsContainer>() const {
return MakeMatcher(new Impl<LhsContainer>(comparator_, matcher_));
}
template <typename LhsContainer>
class Impl : public MatcherInterface<LhsContainer> {
public:
typedef internal::StlContainerView<
GTEST_REMOVE_REFERENCE_AND_CONST_(LhsContainer)> LhsView;
typedef typename LhsView::type LhsStlContainer;
typedef typename LhsView::const_reference LhsStlContainerReference;
// Transforms std::pair<const Key, Value> into std::pair<Key, Value>
// so that we can match associative containers.
typedef typename RemoveConstFromKey<
typename LhsStlContainer::value_type>::type LhsValue;
Impl(const Comparator& comparator, const ContainerMatcher& matcher)
: comparator_(comparator), matcher_(matcher) {}
void DescribeTo(::std::ostream* os) const override {
*os << "(when sorted) ";
matcher_.DescribeTo(os);
}
void DescribeNegationTo(::std::ostream* os) const override {
*os << "(when sorted) ";
matcher_.DescribeNegationTo(os);
}
bool MatchAndExplain(LhsContainer lhs,
MatchResultListener* listener) const override {
LhsStlContainerReference lhs_stl_container = LhsView::ConstReference(lhs);
::std::vector<LhsValue> sorted_container(lhs_stl_container.begin(),
lhs_stl_container.end());
::std::sort(
sorted_container.begin(), sorted_container.end(), comparator_);
if (!listener->IsInterested()) {
// If the listener is not interested, we do not need to
// construct the inner explanation.
return matcher_.Matches(sorted_container);
}
*listener << "which is ";
UniversalPrint(sorted_container, listener->stream());
*listener << " when sorted";
StringMatchResultListener inner_listener;
const bool match = matcher_.MatchAndExplain(sorted_container,
&inner_listener);
PrintIfNotEmpty(inner_listener.str(), listener->stream());
return match;
}
private:
const Comparator comparator_;
const Matcher<const ::std::vector<LhsValue>&> matcher_;
GTEST_DISALLOW_COPY_AND_ASSIGN_(Impl);
};
private:
const Comparator comparator_;
const ContainerMatcher matcher_;
GTEST_DISALLOW_ASSIGN_(WhenSortedByMatcher);
};
// Implements Pointwise(tuple_matcher, rhs_container). tuple_matcher
// must be able to be safely cast to Matcher<std::tuple<const T1&, const
// T2&> >, where T1 and T2 are the types of elements in the LHS
// container and the RHS container respectively.
template <typename TupleMatcher, typename RhsContainer>
class PointwiseMatcher {
GTEST_COMPILE_ASSERT_(
!IsHashTable<GTEST_REMOVE_REFERENCE_AND_CONST_(RhsContainer)>::value,
use_UnorderedPointwise_with_hash_tables);
public:
typedef internal::StlContainerView<RhsContainer> RhsView;
typedef typename RhsView::type RhsStlContainer;
typedef typename RhsStlContainer::value_type RhsValue;
// Like ContainerEq, we make a copy of rhs in case the elements in
// it are modified after this matcher is created.
PointwiseMatcher(const TupleMatcher& tuple_matcher, const RhsContainer& rhs)
: tuple_matcher_(tuple_matcher), rhs_(RhsView::Copy(rhs)) {
// Makes sure the user doesn't instantiate this class template
// with a const or reference type.
(void)testing::StaticAssertTypeEq<RhsContainer,
GTEST_REMOVE_REFERENCE_AND_CONST_(RhsContainer)>();
}
template <typename LhsContainer>
operator Matcher<LhsContainer>() const {
GTEST_COMPILE_ASSERT_(
!IsHashTable<GTEST_REMOVE_REFERENCE_AND_CONST_(LhsContainer)>::value,
use_UnorderedPointwise_with_hash_tables);
return Matcher<LhsContainer>(
new Impl<const LhsContainer&>(tuple_matcher_, rhs_));
}
template <typename LhsContainer>
class Impl : public MatcherInterface<LhsContainer> {
public:
typedef internal::StlContainerView<
GTEST_REMOVE_REFERENCE_AND_CONST_(LhsContainer)> LhsView;
typedef typename LhsView::type LhsStlContainer;
typedef typename LhsView::const_reference LhsStlContainerReference;
typedef typename LhsStlContainer::value_type LhsValue;
// We pass the LHS value and the RHS value to the inner matcher by
// reference, as they may be expensive to copy. We must use tuple
// instead of pair here, as a pair cannot hold references (C++ 98,
// 20.2.2 [lib.pairs]).
typedef ::std::tuple<const LhsValue&, const RhsValue&> InnerMatcherArg;
Impl(const TupleMatcher& tuple_matcher, const RhsStlContainer& rhs)
// mono_tuple_matcher_ holds a monomorphic version of the tuple matcher.
: mono_tuple_matcher_(SafeMatcherCast<InnerMatcherArg>(tuple_matcher)),
rhs_(rhs) {}
void DescribeTo(::std::ostream* os) const override {
*os << "contains " << rhs_.size()
<< " values, where each value and its corresponding value in ";
UniversalPrinter<RhsStlContainer>::Print(rhs_, os);
*os << " ";
mono_tuple_matcher_.DescribeTo(os);
}
void DescribeNegationTo(::std::ostream* os) const override {
*os << "doesn't contain exactly " << rhs_.size()
<< " values, or contains a value x at some index i"
<< " where x and the i-th value of ";
UniversalPrint(rhs_, os);
*os << " ";
mono_tuple_matcher_.DescribeNegationTo(os);
}
bool MatchAndExplain(LhsContainer lhs,
MatchResultListener* listener) const override {
LhsStlContainerReference lhs_stl_container = LhsView::ConstReference(lhs);
const size_t actual_size = lhs_stl_container.size();
if (actual_size != rhs_.size()) {
*listener << "which contains " << actual_size << " values";
return false;
}
typename LhsStlContainer::const_iterator left = lhs_stl_container.begin();
typename RhsStlContainer::const_iterator right = rhs_.begin();
for (size_t i = 0; i != actual_size; ++i, ++left, ++right) {
if (listener->IsInterested()) {
StringMatchResultListener inner_listener;
// Create InnerMatcherArg as a temporarily object to avoid it outlives
// *left and *right. Dereference or the conversion to `const T&` may
// return temp objects, e.g for vector<bool>.
if (!mono_tuple_matcher_.MatchAndExplain(
InnerMatcherArg(ImplicitCast_<const LhsValue&>(*left),
ImplicitCast_<const RhsValue&>(*right)),
&inner_listener)) {
*listener << "where the value pair (";
UniversalPrint(*left, listener->stream());
*listener << ", ";
UniversalPrint(*right, listener->stream());
*listener << ") at index #" << i << " don't match";
PrintIfNotEmpty(inner_listener.str(), listener->stream());
return false;
}
} else {
if (!mono_tuple_matcher_.Matches(
InnerMatcherArg(ImplicitCast_<const LhsValue&>(*left),
ImplicitCast_<const RhsValue&>(*right))))
return false;
}
}
return true;
}
private:
const Matcher<InnerMatcherArg> mono_tuple_matcher_;
const RhsStlContainer rhs_;
GTEST_DISALLOW_ASSIGN_(Impl);
};
private:
const TupleMatcher tuple_matcher_;
const RhsStlContainer rhs_;
GTEST_DISALLOW_ASSIGN_(PointwiseMatcher);
};
// Holds the logic common to ContainsMatcherImpl and EachMatcherImpl.
template <typename Container>
class QuantifierMatcherImpl : public MatcherInterface<Container> {
public:
typedef GTEST_REMOVE_REFERENCE_AND_CONST_(Container) RawContainer;
typedef StlContainerView<RawContainer> View;
typedef typename View::type StlContainer;
typedef typename View::const_reference StlContainerReference;
typedef typename StlContainer::value_type Element;
template <typename InnerMatcher>
explicit QuantifierMatcherImpl(InnerMatcher inner_matcher)
: inner_matcher_(
testing::SafeMatcherCast<const Element&>(inner_matcher)) {}
// Checks whether:
// * All elements in the container match, if all_elements_should_match.
// * Any element in the container matches, if !all_elements_should_match.
bool MatchAndExplainImpl(bool all_elements_should_match,
Container container,
MatchResultListener* listener) const {
StlContainerReference stl_container = View::ConstReference(container);
size_t i = 0;
for (typename StlContainer::const_iterator it = stl_container.begin();
it != stl_container.end(); ++it, ++i) {
StringMatchResultListener inner_listener;
const bool matches = inner_matcher_.MatchAndExplain(*it, &inner_listener);
if (matches != all_elements_should_match) {
*listener << "whose element #" << i
<< (matches ? " matches" : " doesn't match");
PrintIfNotEmpty(inner_listener.str(), listener->stream());
return !all_elements_should_match;
}
}
return all_elements_should_match;
}
protected:
const Matcher<const Element&> inner_matcher_;
GTEST_DISALLOW_ASSIGN_(QuantifierMatcherImpl);
};
// Implements Contains(element_matcher) for the given argument type Container.
// Symmetric to EachMatcherImpl.
template <typename Container>
class ContainsMatcherImpl : public QuantifierMatcherImpl<Container> {
public:
template <typename InnerMatcher>
explicit ContainsMatcherImpl(InnerMatcher inner_matcher)
: QuantifierMatcherImpl<Container>(inner_matcher) {}
// Describes what this matcher does.
void DescribeTo(::std::ostream* os) const override {
*os << "contains at least one element that ";
this->inner_matcher_.DescribeTo(os);
}
void DescribeNegationTo(::std::ostream* os) const override {
*os << "doesn't contain any element that ";
this->inner_matcher_.DescribeTo(os);
}
bool MatchAndExplain(Container container,
MatchResultListener* listener) const override {
return this->MatchAndExplainImpl(false, container, listener);
}
private:
GTEST_DISALLOW_ASSIGN_(ContainsMatcherImpl);
};
// Implements Each(element_matcher) for the given argument type Container.
// Symmetric to ContainsMatcherImpl.
template <typename Container>
class EachMatcherImpl : public QuantifierMatcherImpl<Container> {
public:
template <typename InnerMatcher>
explicit EachMatcherImpl(InnerMatcher inner_matcher)
: QuantifierMatcherImpl<Container>(inner_matcher) {}
// Describes what this matcher does.
void DescribeTo(::std::ostream* os) const override {
*os << "only contains elements that ";
this->inner_matcher_.DescribeTo(os);
}
void DescribeNegationTo(::std::ostream* os) const override {
*os << "contains some element that ";
this->inner_matcher_.DescribeNegationTo(os);
}
bool MatchAndExplain(Container container,
MatchResultListener* listener) const override {
return this->MatchAndExplainImpl(true, container, listener);
}
private:
GTEST_DISALLOW_ASSIGN_(EachMatcherImpl);
};
// Implements polymorphic Contains(element_matcher).
template <typename M>
class ContainsMatcher {
public:
explicit ContainsMatcher(M m) : inner_matcher_(m) {}
template <typename Container>
operator Matcher<Container>() const {
return Matcher<Container>(
new ContainsMatcherImpl<const Container&>(inner_matcher_));
}
private:
const M inner_matcher_;
GTEST_DISALLOW_ASSIGN_(ContainsMatcher);
};
// Implements polymorphic Each(element_matcher).
template <typename M>
class EachMatcher {
public:
explicit EachMatcher(M m) : inner_matcher_(m) {}
template <typename Container>
operator Matcher<Container>() const {
return Matcher<Container>(
new EachMatcherImpl<const Container&>(inner_matcher_));
}
private:
const M inner_matcher_;
GTEST_DISALLOW_ASSIGN_(EachMatcher);
};
struct Rank1 {};
struct Rank0 : Rank1 {};
namespace pair_getters {
using std::get;
template <typename T>
auto First(T& x, Rank1) -> decltype(get<0>(x)) { // NOLINT
return get<0>(x);
}
template <typename T>
auto First(T& x, Rank0) -> decltype((x.first)) { // NOLINT
return x.first;
}
template <typename T>
auto Second(T& x, Rank1) -> decltype(get<1>(x)) { // NOLINT
return get<1>(x);
}
template <typename T>
auto Second(T& x, Rank0) -> decltype((x.second)) { // NOLINT
return x.second;
}
} // namespace pair_getters
// Implements Key(inner_matcher) for the given argument pair type.
// Key(inner_matcher) matches an std::pair whose 'first' field matches
// inner_matcher. For example, Contains(Key(Ge(5))) can be used to match an
// std::map that contains at least one element whose key is >= 5.
template <typename PairType>
class KeyMatcherImpl : public MatcherInterface<PairType> {
public:
typedef GTEST_REMOVE_REFERENCE_AND_CONST_(PairType) RawPairType;
typedef typename RawPairType::first_type KeyType;
template <typename InnerMatcher>
explicit KeyMatcherImpl(InnerMatcher inner_matcher)
: inner_matcher_(
testing::SafeMatcherCast<const KeyType&>(inner_matcher)) {
}
// Returns true if 'key_value.first' (the key) matches the inner matcher.
bool MatchAndExplain(PairType key_value,
MatchResultListener* listener) const override {
StringMatchResultListener inner_listener;
const bool match = inner_matcher_.MatchAndExplain(
pair_getters::First(key_value, Rank0()), &inner_listener);
const std::string explanation = inner_listener.str();
if (explanation != "") {
*listener << "whose first field is a value " << explanation;
}
return match;
}
// Describes what this matcher does.
void DescribeTo(::std::ostream* os) const override {
*os << "has a key that ";
inner_matcher_.DescribeTo(os);
}
// Describes what the negation of this matcher does.
void DescribeNegationTo(::std::ostream* os) const override {
*os << "doesn't have a key that ";
inner_matcher_.DescribeTo(os);
}
private:
const Matcher<const KeyType&> inner_matcher_;
GTEST_DISALLOW_ASSIGN_(KeyMatcherImpl);
};
// Implements polymorphic Key(matcher_for_key).
template <typename M>
class KeyMatcher {
public:
explicit KeyMatcher(M m) : matcher_for_key_(m) {}
template <typename PairType>
operator Matcher<PairType>() const {
return Matcher<PairType>(
new KeyMatcherImpl<const PairType&>(matcher_for_key_));
}
private:
const M matcher_for_key_;
GTEST_DISALLOW_ASSIGN_(KeyMatcher);
};
// Implements Pair(first_matcher, second_matcher) for the given argument pair
// type with its two matchers. See Pair() function below.
template <typename PairType>
class PairMatcherImpl : public MatcherInterface<PairType> {
public:
typedef GTEST_REMOVE_REFERENCE_AND_CONST_(PairType) RawPairType;
typedef typename RawPairType::first_type FirstType;
typedef typename RawPairType::second_type SecondType;
template <typename FirstMatcher, typename SecondMatcher>
PairMatcherImpl(FirstMatcher first_matcher, SecondMatcher second_matcher)