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 <CopyConstructible Arg, Returnable Result> 13 // pointer_to_unary_function<Arg, Result> 14 // ptr_fun(Result (*f)(Arg)); 15 16 #include <functional> 17 #include <type_traits> 18 #include <cassert> 19 unary_f(int i)20 double unary_f(int i) {return 0.5 - i;} 21 main()22 int main() 23 { 24 assert(std::ptr_fun(unary_f)(36) == -35.5); 25 } 26