97 lines · cpp
1// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s2// RUN: %clang_cc1 -fsyntax-only -verify -std=c++14 %s3// RUN: %clang_cc1 -fsyntax-only -verify -std=c++17 %s4// RUN: %clang_cc1 -fsyntax-only -verify -std=c++20 %s5 6namespace std {7 inline namespace __1 {8 template<bool, class = void> struct enable_if {};9 template<class T> struct enable_if<true, T> { using type = T; };10 template<bool B, class T = void> using enable_if_t = typename enable_if<B, T>::type;11 }12}13 14namespace similar_to_user_code {15 // expected-note@+2 {{candidate template ignored: requirement 'sizeof(char) != 1' was not satisfied [with T = char]}}16 template<class T, class = std::enable_if_t<sizeof(T) != 1>>17 void f(T, short);18 19 // expected-note@+2 {{candidate template ignored: requirement 'sizeof(char) != 1' was not satisfied [with T = char]}}20 template<class T, std::enable_if_t<sizeof(T) != 1>* = nullptr>21 void f(T, int);22 23 // expected-note@+2 {{candidate template ignored: requirement 'sizeof(char) != 1' was not satisfied [with T = char]}}24 template<class T>25 std::enable_if_t<sizeof(T) != 1, void> f(T, long);26 27 void test() {28 f('x', 0); // expected-error{{no matching function}}29 }30}31 32namespace similar_to_libcxx_version_14 {33 template<bool, class = void> struct enable_if {};34 template<class T> struct enable_if<true, T> { using type = T; };35 template<bool B, class T = void> using __enable_if_t = typename enable_if<B, T>::type;36 37 // expected-note@+2 {{candidate template ignored: requirement 'sizeof(char) != 1' was not satisfied [with T = char]}}38 template<class T, class = __enable_if_t<sizeof(T) != 1>>39 void f(T, short);40 41 // expected-note@+2 {{candidate template ignored: requirement 'sizeof(char) != 1' was not satisfied [with T = char]}}42 template<class T, __enable_if_t<sizeof(T) != 1>* = nullptr>43 void f(T, int);44 45 // expected-note@+2 {{candidate template ignored: requirement 'sizeof(char) != 1' was not satisfied [with T = char]}}46 template<class T>47 __enable_if_t<sizeof(T) != 1, void> f(T, long);48 49 void test() {50 f('x', 0); // expected-error{{no matching function}}51 }52}53 54namespace similar_to_libcxx_version_13 {55 template<bool> struct _MetaBase {};56 template<> struct _MetaBase<true> { template<class R> using _EnableIfImpl = R; };57 template<bool B, class T = void> using _EnableIf = typename _MetaBase<B>::template _EnableIfImpl<T>;58 59 // expected-note@+2 {{no member named '_EnableIfImpl'}}60 template<class T, class = _EnableIf<sizeof(T) != 1>>61 void f(T, short);62 63 // expected-note@+2 {{no member named '_EnableIfImpl'}}64 template<class T, _EnableIf<sizeof(T) != 1>* = nullptr>65 void f(T, int);66 67 // expected-note@+2 {{no member named '_EnableIfImpl'}}68 template<class T>69 _EnableIf<sizeof(T) != 1, void> f(T, long);70 71 void test() {72 f('x', 0); // expected-error{{no matching function}}73 }74}75 76namespace not_all_names_are_magic {77 template<bool, class = void> struct enable_if {};78 template<class T> struct enable_if<true, T> { using type = T; };79 template<bool B, class T = void> using a_pony = typename enable_if<B, T>::type;80 81 // expected-note@-2 {{candidate template ignored: disabled by 'enable_if' [with T = char]}}82 template<class T, class = a_pony<sizeof(T) != 1>>83 void f(T, short);84 85 // expected-note@-6 {{candidate template ignored: disabled by 'enable_if' [with T = char]}}86 template<class T, a_pony<sizeof(T) != 1>* = nullptr>87 void f(T, int);88 89 // expected-note@-10 {{candidate template ignored: disabled by 'enable_if' [with T = char]}}90 template<class T>91 a_pony<sizeof(T) != 1, void> f(T, long);92 93 void test() {94 f('x', 0); // expected-error{{no matching function}}95 }96}97