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view gcc/testsuite/g++.dg/template/sfinae20.C @ 111:04ced10e8804
gcc 7
author | kono |
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date | Fri, 27 Oct 2017 22:46:09 +0900 |
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// PR c++/44907 // { dg-do compile { target c++11 } } #include <utility> struct A { }; struct B : public A { }; struct C : public A { }; struct D : public B, public C { }; template<typename From, typename To> class mini_is_convertible { typedef char one; typedef struct { char arr[2]; } two; template<typename To1> static void test_aux(To1); template<typename To1, typename From1> static decltype(test_aux<To1>(std::declval<From1>()), one()) test(int); template<typename, typename> static two test(...); public: static const bool value = sizeof(test<To, From>(0)) == 1; }; template<typename From, typename To> const bool mini_is_convertible<From, To>::value; static_assert (!mini_is_convertible<D*, A*>::value, ""); static_assert (!mini_is_convertible<A*, D*>::value, ""); static_assert (!mini_is_convertible<D&, A&>::value, ""); static_assert (!mini_is_convertible<A&, D&>::value, ""); static_assert (!mini_is_convertible<D, A>::value, ""); static_assert (!mini_is_convertible<A, D>::value, "");