diff options
Diffstat (limited to 'gcc/testsuite/g++.dg/template/sfinae20.C')
-rw-r--r-- | gcc/testsuite/g++.dg/template/sfinae20.C | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/template/sfinae20.C b/gcc/testsuite/g++.dg/template/sfinae20.C new file mode 100644 index 000000000..9767bc029 --- /dev/null +++ b/gcc/testsuite/g++.dg/template/sfinae20.C @@ -0,0 +1,45 @@ +// PR c++/44907 +// { dg-options "-std=c++0x" } + +#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, ""); |