| // RUN: %clang_cc1 -std=c++1z -fcxx-exceptions -verify %s |
| // RUN: %clang_cc1 -std=c++1z -fcxx-exceptions -verify %s -DCLASS |
| |
| #ifdef CLASS |
| struct Outer { |
| #endif |
| |
| template<typename> struct A {}; |
| |
| // Valid forms. |
| A(int(&)[1]) -> A<int>; |
| explicit A(int(&)[2]) -> A<int>; |
| |
| // Declarator pieces are not OK. |
| *A(int(&)[3]) -> A<int>; // expected-error {{cannot specify any part of a return type in the declaration of a deduction guide}} |
| &A(int(&)[4]) -> A<int>; // expected-error {{cannot specify any part of a return type in the declaration of a deduction guide}} |
| A(int(&)[5])[3] -> A<int>; |
| #ifdef CLASS // FIXME: These diagnostics are both pretty bad. |
| // expected-error@-2 {{function cannot return array type}} expected-error@-2 {{';'}} |
| #else |
| // expected-error@-4 {{expected function body after function declarator}} |
| #endif |
| |
| (A[3])(int(&)[5][1]) -> A<int>; // expected-error {{'<deduction guide for A>' cannot be the name of a variable}} |
| #ifndef CLASS |
| // expected-error@-2 {{declared as array of functions}} |
| #endif |
| (*A)(int(&)[5][2]) -> A<int>; // expected-error {{'<deduction guide for A>' cannot be the name of a variable}} |
| (&A)(int(&)[5][3]) -> A<int>; // expected-error {{'<deduction guide for A>' cannot be the name of a variable}} |
| (*A(int))(int(&)[5][4]) -> A<int>; // expected-error {{cannot specify any part of a return type in the declaration of a deduction guide}} |
| |
| // (Pending DR) attributes and parens around the declarator-id are OK. |
| [[deprecated]] A(int(&)[6]) [[]] -> A<int> [[]]; |
| A [[]] (int(&)[7]) -> A<int>; |
| (A)(int(&)[8]) -> A<int>; |
| |
| // ... but the trailing-return-type is part of the function-declarator as normal |
| (A(int(&)[9])) -> A<int>; |
| #ifdef CLASS // FIXME: These diagnostics are both pretty bad. |
| // expected-error@-2 {{deduction guide declaration without trailing return type}} expected-error@-2 {{';'}} |
| #else |
| // expected-error@-4 {{expected function body after function declarator}} |
| #endif |
| (A(int(&)[10]) -> A<int>); // expected-error {{trailing return type may not be nested within parentheses}} |
| |
| // A trailing-return-type is mandatory. |
| A(int(&)[11]); // expected-error {{deduction guide declaration without trailing return type}} |
| |
| // No type specifier is permitted; we don't even parse such cases as a deduction-guide. |
| int A(int) -> A<int>; // expected-error {{function with trailing return type must specify return type 'auto', not 'int'}} |
| template<typename T> struct B {}; // expected-note {{here}} |
| auto B(int) -> B<int>; // expected-error {{redefinition of 'B' as different kind of symbol}} |
| |
| // No storage class specifier, function specifier, ... |
| friend A(int(&)[20]) -> A<int>; |
| #ifdef CLASS |
| // expected-error@-2 {{cannot declare a deduction guide as a friend}} |
| #else |
| // expected-error@-4 {{'friend' used outside of class}} |
| #endif |
| typedef A(int(&)[21]) -> A<int>; // expected-error {{deduction guide cannot be declared 'typedef'}} |
| constexpr A(int(&)[22]) -> A<int>; // expected-error {{deduction guide cannot be declared 'constexpr'}} |
| inline A(int(&)[23]) -> A<int>; // expected-error {{deduction guide cannot be declared 'inline'}} |
| static A(int(&)[24]) -> A<int>; // expected-error {{deduction guide cannot be declared 'static'}} |
| thread_local A(int(&)[25]) -> A<int>; // expected-error {{'thread_local' is only allowed on variable declarations}} |
| extern A(int(&)[26]) -> A<int>; |
| #ifdef CLASS |
| // expected-error@-2 {{storage class specified for a member}} |
| #else |
| // expected-error@-4 {{deduction guide cannot be declared 'extern'}} |
| #endif |
| mutable A(int(&)[27]) -> A<int>; // expected-error-re {{{{'mutable' cannot be applied to|illegal storage class on}} function}} |
| virtual A(int(&)[28]) -> A<int>; // expected-error {{'virtual' can only appear on non-static member functions}} |
| const A(int(&)[28]) -> A<int>; // expected-error {{deduction guide cannot be declared 'const'}} |
| |
| const volatile static constexpr inline A(int(&)[29]) -> A<int>; // expected-error {{deduction guide cannot be declared 'static inline constexpr const volatile'}} |
| |
| A(int(&)[30]) const -> A<int>; // expected-error {{deduction guide cannot have 'const' qualifier}} |
| |
| // No definition is allowed. |
| A(int(&)[40]) -> A<int> {} // expected-error {{deduction guide cannot have a function definition}} |
| A(int(&)[41]) -> A<int> = default; // expected-error {{deduction guide cannot have a function definition}} expected-error {{only special member functions may be defaulted}} |
| A(int(&)[42]) -> A<int> = delete; // expected-error {{deduction guide cannot have a function definition}} |
| A(int(&)[43]) -> A<int> try {} catch (...) {} // expected-error {{deduction guide cannot have a function definition}} |
| |
| #ifdef CLASS |
| }; |
| #endif |
| |
| namespace ExplicitInst { |
| // Explicit instantiation / specialization is not permitted. |
| template<typename T> struct B {}; |
| template<typename T> B(T) -> B<T>; |
| template<> B(int) -> B<int>; // expected-error {{deduction guide cannot be explicitly specialized}} |
| extern template B(float) -> B<float>; // expected-error {{deduction guide cannot be explicitly instantiated}} |
| template B(char) -> B<char>; // expected-error {{deduction guide cannot be explicitly instantiated}} |
| |
| // An attempt at partial specialization doesn't even parse as a deduction-guide. |
| template<typename T> B<T*>(T*) -> B<T*>; // expected-error 1+{{}} expected-note 0+{{}} |
| |
| struct X { |
| template<typename T> struct C {}; |
| template<typename T> C(T) -> C<T>; |
| template<> C(int) -> C<int>; // expected-error {{explicit specialization of '<deduction guide for C>' in class scope}} |
| extern template C(float) -> C<float>; // expected-error {{expected member name or ';'}} |
| template C(char) -> C<char>; // expected-error {{expected '<' after 'template'}} |
| }; |
| } |