37 lines
1.3 KiB
C++
37 lines
1.3 KiB
C++
// RUN: %clang_cc1 %std_cxx98-14 -fsyntax-only -verify=precxx17 %s
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// RUN: %clang_cc1 -std=c++17 -fsyntax-only -verify=expected %s
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// RUN: %clang_cc1 -std=c++17 -DFAILED_CXX17 -fsyntax-only -verify=failcxx17 %s
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// RUN: %clang_cc1 %std_cxx20- -fsyntax-only -verify=cxx20 %s
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// expected-no-diagnostics
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template<class T> auto f(T t) -> decltype(++t); // precxx17-warning {{incrementing expression of type bool is deprecated}}
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auto f(...) -> void;
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void g() { f(true); }
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#ifdef FAILED_CXX17
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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}}
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auto f1(void) -> void; // failcxx17-note {{candidate function not viable: requires 0 arguments, but 1 was provided}}
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void g1() { f1(true); } // failcxx17-error {{no matching function for call to 'f1'}}
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#endif
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#if __cplusplus >= 202002L
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template <class T>
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concept can_increment = requires(T t) {
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++t;
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};
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template <class T>
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void f() {
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static_assert(requires(T t) { ++t; }); // cxx20-error {{static assertion failed due to requirement 'requires (bool t) { <<error-expression>>; }'}}
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}
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int main() {
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f<bool>(); // cxx20-note {{in instantiation of function template specialization 'f<bool>' requested here}}
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static_assert(!can_increment<bool>);
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return 0;
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}
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#endif
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