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 // reference_wrapper 13 14 // template <class... ArgTypes> 15 // requires Callable<T, ArgTypes&&...> 16 // Callable<T, ArgTypes&&...>::result_type 17 // operator()(ArgTypes&&... args) const; 18 19 #include <functional> 20 #include <cassert> 21 22 // 0 args, return void 23 24 int count = 0; 25 26 void f_void_0() 27 { 28 ++count; 29 } 30 31 struct A_void_0 32 { 33 void operator()() {++count;} 34 }; 35 36 void 37 test_void_0() 38 { 39 int save_count = count; 40 // function 41 { 42 std::reference_wrapper<void ()> r1(f_void_0); 43 r1(); 44 assert(count == save_count+1); 45 save_count = count; 46 } 47 // function pointer 48 { 49 void (*fp)() = f_void_0; 50 std::reference_wrapper<void (*)()> r1(fp); 51 r1(); 52 assert(count == save_count+1); 53 save_count = count; 54 } 55 // functor 56 { 57 A_void_0 a0; 58 std::reference_wrapper<A_void_0> r1(a0); 59 r1(); 60 assert(count == save_count+1); 61 save_count = count; 62 } 63 } 64 65 int main() 66 { 67 test_void_0(); 68 } 69
