57 lines
1.6 KiB
C++
57 lines
1.6 KiB
C++
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// RUN: %clang_cc1 -std=c++2a -fsyntax-only -verify %s
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namespace std {
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constexpr bool is_constant_evaluated() noexcept {
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return __builtin_is_constant_evaluated();
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}
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} // namespace std
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constexpr int fn1() {
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if constexpr (std::is_constant_evaluated()) // expected-warning {{'std::is_constant_evaluated' will always evaluate to 'true' in a manifestly constant-evaluated expression}}
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return 0;
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else
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return 1;
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}
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constexpr int fn2() {
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if constexpr (!std::is_constant_evaluated()) // expected-warning {{'std::is_constant_evaluated' will always evaluate to 'true' in a manifestly constant-evaluated expression}}
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return 0;
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else
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return 1;
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}
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constexpr int fn3() {
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if constexpr (std::is_constant_evaluated() == false) // expected-warning {{'std::is_constant_evaluated' will always evaluate to 'true' in a manifestly constant-evaluated expression}}
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return 0;
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else
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return 1;
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}
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constexpr int fn4() {
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if constexpr (__builtin_is_constant_evaluated() == true) // expected-warning {{'__builtin_is_constant_evaluated' will always evaluate to 'true' in a manifestly constant-evaluated expression}}
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return 0;
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else
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return 1;
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}
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constexpr int fn5() {
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if constexpr (__builtin_is_constant_evaluated()) // expected-warning {{'__builtin_is_constant_evaluated' will always evaluate to 'true' in a manifestly constant-evaluated expression}}
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return 0;
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else
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return 1;
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}
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constexpr int nowarn1() {
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if (std::is_constant_evaluated())
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return 0;
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else
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return 1;
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}
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constexpr int nowarn2() {
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if (!__builtin_is_constant_evaluated())
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return 0;
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else
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return 1;
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}
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