1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // <functional> 11 12 // template<Returnable R, CopyConstructible... ArgTypes> 13 // class function<R(ArgTypes...)> 14 // : public unary_function<T1, R> // iff sizeof...(ArgTypes) == 1 and 15 // // ArgTypes contains T1 16 // : public binary_function<T1, T2, R> // iff sizeof...(ArgTypes) == 2 and 17 // // ArgTypes contains T1 and T2 18 // { 19 // public: 20 // typedef R result_type; 21 // ... 22 // }; 23 24 #include <functional> 25 #include <type_traits> 26 27 int main() 28 { 29 static_assert((!std::is_base_of<std::unary_function <int, int>, 30 std::function<int()> >::value), ""); 31 static_assert((!std::is_base_of<std::binary_function<int, int, int>, 32 std::function<int()> >::value), ""); 33 static_assert(( std::is_same< std::function<int()>::result_type, 34 int>::value), ""); 35 36 static_assert(( std::is_base_of<std::unary_function <int, double>, 37 std::function<double(int)> >::value), ""); 38 static_assert((!std::is_base_of<std::binary_function<int, int, double>, 39 std::function<double(int)> >::value), ""); 40 static_assert(( std::is_same< std::function<double(int)>::result_type, 41 double>::value), ""); 42 43 static_assert((!std::is_base_of<std::unary_function <int, double>, 44 std::function<double(int, char)> >::value), ""); 45 static_assert(( std::is_base_of<std::binary_function<int, char, double>, 46 std::function<double(int, char)> >::value), ""); 47 static_assert(( std::is_same< std::function<double(int, char)>::result_type, 48 double>::value), ""); 49 } 50
