1c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant//===----------------------------------------------------------------------===// 2c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// 3c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// The LLVM Compiler Infrastructure 4c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// 5b64f8b07c104c6cc986570ac8ee0ed16a9f23976Howard Hinnant// This file is dual licensed under the MIT and the University of Illinois Open 6b64f8b07c104c6cc986570ac8ee0ed16a9f23976Howard Hinnant// Source Licenses. See LICENSE.TXT for details. 7c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// 8c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant//===----------------------------------------------------------------------===// 9c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 10c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// <functional> 11c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 12c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// reference_wrapper 13c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 14c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// template <class... ArgTypes> 15c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// requires Callable<T, ArgTypes&&...> 16c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// Callable<T, ArgTypes&&...>::result_type 17c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// operator()(ArgTypes&&... args) const; 18c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 19c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant#include <functional> 20c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant#include <cassert> 21c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 22c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// 0 args, return int 23c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 24c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnantint count = 0; 25c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 26c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnantint f_int_0() 27c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant{ 28c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant return 3; 29c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant} 30c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 31c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnantstruct A_int_0 32c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant{ 33c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant int operator()() {return 4;} 34c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant}; 35c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 36c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnantvoid 37c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnanttest_int_0() 38c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant{ 39c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant // function 40c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant { 41c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant std::reference_wrapper<int ()> r1(f_int_0); 42c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(r1() == 3); 43c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant } 44c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant // function pointer 45c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant { 46c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant int (*fp)() = f_int_0; 47c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant std::reference_wrapper<int (*)()> r1(fp); 48c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(r1() == 3); 49c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant } 50c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant // functor 51c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant { 52c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant A_int_0 a0; 53c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant std::reference_wrapper<A_int_0> r1(a0); 54c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(r1() == 4); 55c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant } 56c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant} 57c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 58c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// 1 arg, return void 59c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 60c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnantvoid f_void_1(int i) 61c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant{ 62c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant count += i; 63c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant} 64c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 65c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnantstruct A_void_1 66c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant{ 67c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant void operator()(int i) 68c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant { 69c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant count += i; 70c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant } 71c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant}; 72c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 73c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnantint main() 74c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant{ 75c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant test_int_0(); 76c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant} 77