1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
|
// RUN: %clang_cc1 %std_cxx98-14 -fsyntax-only -verify=precxx17 %s
// RUN: %clang_cc1 -std=c++17 -fsyntax-only -verify=expected %s
// RUN: %clang_cc1 -std=c++17 -DFAILED_CXX17 -fsyntax-only -verify=failcxx17 %s
// RUN: %clang_cc1 %std_cxx20- -fsyntax-only -verify=cxx20 %s
// expected-no-diagnostics
template<class T> auto f(T t) -> decltype(++t); // precxx17-warning {{incrementing expression of type bool is deprecated}}
auto f(...) -> void;
void g() { f(true); }
#ifdef FAILED_CXX17
template<class T> auto f1(T t) -> decltype(++t); // failcxx17-note {{candidate template ignored: substitution failure [with T = bool]: ISO C++17 does not allow incrementing expression of type bool}}
auto f1(void) -> void; // failcxx17-note {{candidate function not viable: requires 0 arguments, but 1 was provided}}
void g1() { f1(true); } // failcxx17-error {{no matching function for call to 'f1'}}
#endif
#if __cplusplus >= 202002L
template <class T>
concept can_increment = requires(T t) {
++t;
};
template <class T>
void f() {
static_assert(requires(T t) { ++t; }); // cxx20-error {{static assertion failed due to requirement 'requires (bool t) { <<error-expression>>; }'}}
}
int main() {
f<bool>(); // cxx20-note {{in instantiation of function template specialization 'f<bool>' requested here}}
static_assert(!can_increment<bool>);
return 0;
}
#endif
|
