28 lines
817 B
C++
28 lines
817 B
C++
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// RUN: %clang_cc1 -std=c++2a -x c++ %s -verify
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template<auto T, decltype(T) U>
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concept C1 = sizeof(U) >= 4;
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// sizeof(U) >= 4 [U = U (decltype(T))]
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template<typename Y, char V>
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concept C2 = C1<Y{}, V>;
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// sizeof(U) >= 4 [U = V (decltype(Y{}))]
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template<char W>
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constexpr int foo() requires C2<int, W> { return 1; }
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// sizeof(U) >= 4 [U = W (decltype(int{}))]
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template<char X>
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// expected-note@+1{{candidate function}}
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constexpr int foo() requires C1<1, X> && true { return 2; }
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// sizeof(U) >= 4 [U = X (decltype(1))]
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static_assert(foo<'a'>() == 2);
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template<char Z>
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// expected-note@+1{{candidate function}}
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constexpr int foo() requires C2<long long, Z> && true { return 3; }
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// sizeof(U) >= 4 [U = Z (decltype(long long{}))]
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static_assert(foo<'a'>() == 3);
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// expected-error@-1{{call to 'foo' is ambiguous}}
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