afb81b8278
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30 lines
406 B
C++
30 lines
406 B
C++
#if !defined(__cpp_concepts) || __cpp_concepts == 0
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#error "Sorry, Charlie. No concepts"
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#else
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#if __cpp_concepts <= 201507L
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#define concept concept bool
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#endif
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template<class>
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concept True = true;
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template<class T>
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constexpr bool test(T)
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{
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return false;
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}
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template<class T>
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requires True<T>
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constexpr bool test(T)
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{
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return true;
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}
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int main()
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{
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static_assert(::test(42), "");
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}
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#endif
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