derek.holloway
7502bf64a4
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112 lines
3.3 KiB
C++
112 lines
3.3 KiB
C++
// RUN: %clang_cc1 -std=c++2a -x c++ %s -verify=expected,cxx20
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// RUN: %clang_cc1 -std=c++2c -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; } // #cand1
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// sizeof(U) >= 4 [U = W (decltype(int{}))]
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template<char X>
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constexpr int foo() requires C1<1, X> && true { return 2; } // #cand2
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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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constexpr int foo() requires C2<long long, Z> && true { return 3; } // #cand3
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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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// expected-note@#cand2 {{candidate function}}
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// expected-note@#cand3 {{candidate function}}
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namespace case1 {
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template<auto T, decltype(T) U>
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concept C1 = sizeof(T) >= 4; // #case1_C1
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template<typename Y, char V>
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concept C2 = C1<Y{}, V>; // #case1_C2
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template<class T, char W>
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constexpr int foo() requires C2<T, W> { return 1; } // #case1_foo1
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template<class T, char X>
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constexpr int foo() requires C1<T{}, X> && true { return 2; } // #case1_foo2
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static_assert(foo<char, 'a'>() == 2);
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// expected-error@-1{{no matching function for call to 'foo'}}
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// expected-note@#case1_foo1{{candidate template ignored: constraints not satisfied [with T = char, W = 'a']}}
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// expected-note@#case1_foo1{{because 'C2<char, 'a'>' evaluated to false}}
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// expected-note@#case1_C2{{because 'C1<char{}, 'a'>' evaluated to false}}
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// expected-note@#case1_C1{{because 'sizeof ('\x00') >= 4' (1 >= 4) evaluated to false}}
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// expected-note@#case1_foo2{{candidate template ignored: constraints not satisfied [with T = char, X = 'a']}}
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// expected-note@#case1_foo2{{because 'C1<char{}, 'a'>' evaluated to false}}
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// expected-note@#case1_C1{{because 'sizeof ('\x00') >= 4' (1 >= 4) evaluated to false}}
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static_assert(foo<int, 'a'>() == 2);
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}
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namespace packs {
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template<auto T, decltype(T) U>
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concept C1 = sizeof(U) >= 4;
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template<typename Y, char V>
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concept C2 = C1<Y{}, V>;
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template<char... W>
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constexpr int foo() requires (C2<int, W> && ...) { return 1; } // #packs-cand1
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template<char... X>
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constexpr int foo() requires (C1<1, X> && ...) && true { return 2; } // #packs-cand2
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static_assert(foo<'a'>() == 2);
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// cxx20-error@-1{{call to 'foo' is ambiguous}}
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// cxx20-note@#packs-cand1 {{candidate function}}
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// cxx20-note@#packs-cand2 {{candidate function}}
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}
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namespace case2 {
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template<auto T> concept C1 = sizeof(decltype(T)) >= 0;
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template<typename Y> concept C2 = C1<Y{}>;
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template<char W>
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constexpr int foo() requires C2<int> { return 1; }
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template<char X>
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constexpr int foo() requires C1<0> && true { return 2; }
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static_assert(foo<0>() == 2);
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}
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namespace case3 {
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template<auto T> concept C1 = sizeof(decltype(T)) >= 0;
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template<typename Y> concept C2 = C1<Y{}>;
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template<char W>
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constexpr int foo() requires C2<int> { return 1; } // #case3_foo1
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template<char X>
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constexpr int foo() requires C1<1> && true { return 2; } // #case3_foo2
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static_assert(foo<0>() == 2);
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// expected-error@-1{{call to 'foo' is ambiguous}}
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// expected-note@#case3_foo1 {{candidate function}}
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// expected-note@#case3_foo2 {{candidate function}}
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}
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