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view gcc/testsuite/g++.dg/cpp2a/concepts-partial-spec6.C @ 145:1830386684a0
gcc-9.2.0
author | anatofuz |
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date | Thu, 13 Feb 2020 11:34:05 +0900 |
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// PR c++/67152 // { dg-do compile { target c++2a } } template <class T> concept HasType = requires { typename T::type; }; template<class T> struct trait { using type = void; }; struct has_type { using type = void; }; // Instantiation here trait<has_type>::type foo() {} // constrained version here. Type "has_type" would fail this // constraint so this partial specialization would not have been // selected. template<class T> requires (!HasType<T>) struct trait<T> { using type = void; };