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// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
// RUN: %clang_cc1 -fsyntax-only -verify -std=c++14 %s
// RUN: %clang_cc1 -fsyntax-only -verify -std=c++17 %s
// RUN: %clang_cc1 -fsyntax-only -verify -std=c++20 %s
namespace std {
inline namespace __1 {
template<bool, class = void> struct enable_if {};
template<class T> struct enable_if<true, T> { using type = T; };
template<bool B, class T = void> using enable_if_t = typename enable_if<B, T>::type;
}
}
namespace similar_to_user_code {
// expected-note@+2 {{candidate template ignored: requirement 'sizeof(char) != 1' was not satisfied [with T = char]}}
template<class T, class = std::enable_if_t<sizeof(T) != 1>>
void f(T, short);
// expected-note@+2 {{candidate template ignored: requirement 'sizeof(char) != 1' was not satisfied [with T = char]}}
template<class T, std::enable_if_t<sizeof(T) != 1>* = nullptr>
void f(T, int);
// expected-note@+2 {{candidate template ignored: requirement 'sizeof(char) != 1' was not satisfied [with T = char]}}
template<class T>
std::enable_if_t<sizeof(T) != 1, void> f(T, long);
void test() {
f('x', 0); // expected-error{{no matching function}}
}
}
namespace similar_to_libcxx_version_14 {
template<bool, class = void> struct enable_if {};
template<class T> struct enable_if<true, T> { using type = T; };
template<bool B, class T = void> using __enable_if_t = typename enable_if<B, T>::type;
// expected-note@+2 {{candidate template ignored: requirement 'sizeof(char) != 1' was not satisfied [with T = char]}}
template<class T, class = __enable_if_t<sizeof(T) != 1>>
void f(T, short);
// expected-note@+2 {{candidate template ignored: requirement 'sizeof(char) != 1' was not satisfied [with T = char]}}
template<class T, __enable_if_t<sizeof(T) != 1>* = nullptr>
void f(T, int);
// expected-note@+2 {{candidate template ignored: requirement 'sizeof(char) != 1' was not satisfied [with T = char]}}
template<class T>
__enable_if_t<sizeof(T) != 1, void> f(T, long);
void test() {
f('x', 0); // expected-error{{no matching function}}
}
}
namespace similar_to_libcxx_version_13 {
template<bool> struct _MetaBase {};
template<> struct _MetaBase<true> { template<class R> using _EnableIfImpl = R; };
template<bool B, class T = void> using _EnableIf = typename _MetaBase<B>::template _EnableIfImpl<T>;
// expected-note@+2 {{no member named '_EnableIfImpl'}}
template<class T, class = _EnableIf<sizeof(T) != 1>>
void f(T, short);
// expected-note@+2 {{no member named '_EnableIfImpl'}}
template<class T, _EnableIf<sizeof(T) != 1>* = nullptr>
void f(T, int);
// expected-note@+2 {{no member named '_EnableIfImpl'}}
template<class T>
_EnableIf<sizeof(T) != 1, void> f(T, long);
void test() {
f('x', 0); // expected-error{{no matching function}}
}
}
namespace not_all_names_are_magic {
template<bool, class = void> struct enable_if {};
template<class T> struct enable_if<true, T> { using type = T; };
template<bool B, class T = void> using a_pony = typename enable_if<B, T>::type;
// expected-note@-2 {{candidate template ignored: disabled by 'enable_if' [with T = char]}}
template<class T, class = a_pony<sizeof(T) != 1>>
void f(T, short);
// expected-note@-6 {{candidate template ignored: disabled by 'enable_if' [with T = char]}}
template<class T, a_pony<sizeof(T) != 1>* = nullptr>
void f(T, int);
// expected-note@-10 {{candidate template ignored: disabled by 'enable_if' [with T = char]}}
template<class T>
a_pony<sizeof(T) != 1, void> f(T, long);
void test() {
f('x', 0); // expected-error{{no matching function}}
}
}
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