33 lines
856 B
C++
33 lines
856 B
C++
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// RUN: %clang_cc1 -std=c++20 -verify %s
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// expected-no-diagnostics
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namespace P1937R2 {
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struct N {
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constexpr N() {}
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N(N const&) = delete;
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};
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template<typename T> constexpr void bad_assert_copyable() { T t; T t2 = t; }
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using ineffective = decltype(bad_assert_copyable<N>());
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template<typename T> consteval void assert_copyable() { T t; T t2 = t; }
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// Prior to P1937R2 consteval functions were evaluated even in otherwise
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// unevaluated context, now this is well-formed.
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using check = decltype(assert_copyable<N>());
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template<typename T>
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__add_rvalue_reference(T) declval();
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constexpr auto add1(auto lhs, auto rhs) {
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return lhs + rhs;
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}
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using T = decltype(add1(declval<int>(), declval<int>()));
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consteval auto add2(auto lhs, auto rhs) {
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return lhs + rhs;
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}
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using T = decltype(add2(declval<int>(), declval<int>()));
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} // namespace P1937R2
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