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 // class function<R(ArgTypes...)> 13 14 // function& operator=(nullptr_t); 15 16 #include <functional> 17 #include <new> 18 #include <cstdlib> 19 #include <cassert> 20 21 int new_called = 0; 22 23 void* operator new(std::size_t s) throw(std::bad_alloc) 24 { 25 ++new_called; 26 return std::malloc(s); 27 } 28 29 void operator delete(void* p) throw() 30 { 31 --new_called; 32 std::free(p); 33 } 34 35 class A 36 { 37 int data_[10]; 38 public: 39 static int count; 40 41 A() 42 { 43 ++count; 44 for (int i = 0; i < 10; ++i) 45 data_[i] = i; 46 } 47 48 A(const A&) {++count;} 49 50 ~A() {--count;} 51 52 int operator()(int i) const 53 { 54 for (int j = 0; j < 10; ++j) 55 i += data_[j]; 56 return i; 57 } 58 }; 59 60 int A::count = 0; 61 62 int g(int) {return 0;} 63 64 int main() 65 { 66 assert(new_called == 0); 67 { 68 std::function<int(int)> f = A(); 69 assert(A::count == 1); 70 assert(new_called == 1); 71 assert(f.target<A>()); 72 f = nullptr; 73 assert(A::count == 0); 74 assert(new_called == 0); 75 assert(f.target<A>() == 0); 76 } 77 { 78 std::function<int(int)> f = g; 79 assert(new_called == 0); 80 assert(f.target<int(*)(int)>()); 81 assert(f.target<A>() == 0); 82 f = nullptr; 83 assert(new_called == 0); 84 assert(f.target<int(*)(int)>() == 0); 85 } 86 } 87
