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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#include <functional>
#include <typeinfo>
#include <string>
#include <cstdio>
#include <cassert>
#include "test_macros.h"
#include "demangle.h"
#if TEST_STD_VER < 11
#error This header requires C++11 or greater
// TypeID - Represent a unique identifier for a type. TypeID allows equality
// comparisons between different types.
struct TypeID {
friend bool operator==(TypeID const& LHS, TypeID const& RHS)
{return LHS.m_id == RHS.m_id; }
friend bool operator!=(TypeID const& LHS, TypeID const& RHS)
{return LHS.m_id != RHS.m_id; }
std::string name() const {
return demangle(m_id);
void dump() const {
std::string s = name();
std::printf("TypeID: %s\n", s.c_str());
explicit constexpr TypeID(const char* xid) : m_id(xid) {}
TypeID(const TypeID&) = delete;
TypeID& operator=(TypeID const&) = delete;
const char* const m_id;
template <class T> friend TypeID const& makeTypeIDImp();
// makeTypeID - Return the TypeID for the specified type 'T'.
template <class T>
inline TypeID const& makeTypeIDImp() {
static const TypeID id(typeid(T).name());
return id;
template <class T>
struct TypeWrapper {};
template <class T>
inline TypeID const& makeTypeID() {
return makeTypeIDImp<TypeWrapper<T>>();
template <class ...Args>
struct ArgumentListID {};
// makeArgumentID - Create and return a unique identifier for a given set
// of arguments.
template <class ...Args>
inline TypeID const& makeArgumentID() {
return makeTypeIDImp<ArgumentListID<Args...>>();
// COMPARE_TYPEID(...) is a utility macro for generating diagnostics when
// two typeid's are expected to be equal
#define COMPARE_TYPEID(LHS, RHS) CompareTypeIDVerbose(#LHS, LHS, #RHS, RHS)
inline bool CompareTypeIDVerbose(const char* LHSString, TypeID const* LHS,
const char* RHSString, TypeID const* RHS) {
if (*LHS == *RHS)
return true;
std::printf("TypeID's not equal:\n");
std::printf("%s: %s\n----------\n%s: %s\n",
LHSString, LHS->name().c_str(),
RHSString, RHS->name().c_str());
return false;