derek.holloway
7502bf64a4
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92 lines
3.0 KiB
C++
92 lines
3.0 KiB
C++
// RUN: %clang_cc1 -std=c++20 -verify %s
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namespace N0 {
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template<int I>
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concept C = I >= 4;
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template<int I>
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concept D = I < 8;
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template<int I>
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struct A { // #defined-here
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constexpr static int f() { return 0; }
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constexpr static int f() requires C<I> && D<I> { return 1; }
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constexpr static int f() requires C<I> { return 2; }
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constexpr static int g() requires C<I> { return 0; } // #candidate-0
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constexpr static int g() requires D<I> { return 1; } // #candidate-1
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constexpr static int h() requires C<I> { return 0; } // expected-note {{member declaration nearly matches}}
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};
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template<>
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constexpr int A<2>::f() { return 3; }
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template<>
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constexpr int A<4>::f() { return 4; }
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template<>
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constexpr int A<8>::f() { return 5; }
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static_assert(A<3>::f() == 0);
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static_assert(A<5>::f() == 1);
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static_assert(A<9>::f() == 2);
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static_assert(A<2>::f() == 3);
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static_assert(A<4>::f() == 4);
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static_assert(A<8>::f() == 5);
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template<>
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constexpr int A<0>::g() { return 2; }
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template<>
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constexpr int A<8>::g() { return 3; }
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template<>
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constexpr int A<6>::g() { return 4; } // expected-error {{ambiguous member function specialization 'N0::A<6>::g' of 'N0::A::g'}}
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// expected-note@#candidate-0 {{member function specialization matches 'g'}}
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// expected-note@#candidate-1 {{member function specialization matches 'g'}}
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static_assert(A<9>::g() == 0);
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static_assert(A<1>::g() == 1);
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static_assert(A<0>::g() == 2);
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static_assert(A<8>::g() == 3);
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template<>
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constexpr int A<4>::h() { return 1; }
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template<>
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constexpr int A<0>::h() { return 2; } // expected-error {{out-of-line definition of 'h' does not match any declaration in 'N0::A<0>'}}
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// expected-note@#defined-here {{defined here}}
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static_assert(A<5>::h() == 0);
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static_assert(A<4>::h() == 1);
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} // namespace N0
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namespace N1 {
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template<int I>
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concept C = I > 0;
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template<int I>
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concept D = I > 1;
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template<int I>
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concept E = I > 2;
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template<int I>
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struct A {
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void f() requires C<I> && D<I>; // expected-note {{member function specialization matches 'f'}}
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void f() requires C<I> && E<I>; // expected-note {{member function specialization matches 'f'}}
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void f() requires C<I> && D<I> && true; // expected-note {{member function specialization matches 'f'}}
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void g() requires C<I> && E<I>; // expected-note {{member function specialization matches 'g'}}
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void g() requires C<I> && D<I>; // expected-note {{member function specialization matches 'g'}}
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void g() requires C<I> && D<I> && true; // expected-note {{member function specialization matches 'g'}}
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};
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template<>
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void A<3>::f(); // expected-error {{ambiguous member function specialization 'N1::A<3>::f' of 'N1::A::f'}}
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template<>
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void A<3>::g(); // expected-error {{ambiguous member function specialization 'N1::A<3>::g' of 'N1::A::g'}}
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} // namespace N1
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