2f8ac0758b
satisfaction. Previously we used the rules for constant folding in a non-constant context, meaning that we'd incorrectly accept foldable non-constant expressions and that std::is_constant_evaluated() would evaluate to false.
35 lines
816 B
C++
35 lines
816 B
C++
// RUN: %clang_cc1 -std=c++2a -verify %s
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// RUN: %clang_cc1 -std=c++2a -verify %s -fno-concept-satisfaction-caching -DNO_CACHE
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// expected-no-diagnostics
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template<typename T>
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concept C = (f(T()), true);
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template<typename T>
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constexpr bool foo() { return false; }
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template<typename T>
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requires (f(T()), true)
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constexpr bool foo() requires (f(T()), true) { return true; }
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namespace a {
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struct A {};
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constexpr void f(A a) {}
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}
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static_assert(C<a::A>);
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static_assert(foo<a::A>());
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namespace a {
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// This makes calls to f ambiguous, but the second check will still succeed
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// because the constraint satisfaction results are cached.
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constexpr void f(A a, int = 2) {}
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}
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#ifdef NO_CACHE
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static_assert(!C<a::A>);
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static_assert(!foo<a::A>());
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#else
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static_assert(C<a::A>);
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static_assert(foo<a::A>());
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#endif
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