Mercurial > hg > CbC > CbC_gcc
diff gcc/testsuite/g++.dg/cpp0x/sfinae3.C @ 111:04ced10e8804
gcc 7
author | kono |
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date | Fri, 27 Oct 2017 22:46:09 +0900 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/gcc/testsuite/g++.dg/cpp0x/sfinae3.C Fri Oct 27 22:46:09 2017 +0900 @@ -0,0 +1,56 @@ +// { dg-do compile { target c++11 } } + +namespace std { template <class T> T&& declval(); } + +template<typename _Tp, typename... _Args> + class is_constructible_mini + { + typedef char __one; + typedef struct { char __arr[2]; } __two; + + template<typename _Tp1, typename... _Args1> + static decltype(::new _Tp1(std::declval<_Args1>()...), __one()) + __test(int); + + template<typename, typename...> + static __two __test(...); + + public: + static const bool value = sizeof(__test<_Tp, _Args...>(0)) == 1; + }; + +/* +template<typename _Tp> + class is_constructible_mini<_Tp> + { + typedef char __one; + typedef struct { char __arr[2]; } __two; + + template<typename _Tp1> + static decltype(::new _Tp1, __one()) __test(int); + + template<typename> + static __two __test(...); + + public: + static const bool value + = sizeof(__test<typename std::remove_cv<_Tp>::type>(0)) == 1; + }; +*/ + +struct A +{ + A(int); +}; + +struct B { }; + +static_assert( is_constructible_mini<A, int>::value, ""); +static_assert( is_constructible_mini<A, A>::value, ""); +static_assert( !is_constructible_mini<A, int, double>::value, ""); + +static_assert( !is_constructible_mini<A>::value, ""); // doesn't compile without the + // partial specialization + +static_assert( is_constructible_mini<B>::value, ""); +static_assert( is_constructible_mini<const B>::value, "");