diff options
Diffstat (limited to 'gcc/testsuite/g++.dg/cpp0x/sfinae3.C')
-rw-r--r-- | gcc/testsuite/g++.dg/cpp0x/sfinae3.C | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/cpp0x/sfinae3.C b/gcc/testsuite/g++.dg/cpp0x/sfinae3.C new file mode 100644 index 000000000..8582ba777 --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp0x/sfinae3.C @@ -0,0 +1,56 @@ +// { dg-options -std=c++0x } + +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, ""); |