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 // <memory> 11 12 // shared_ptr 13 14 // template<class Y> shared_ptr& operator=(shared_ptr<Y>&& r); 15 16 #include <memory> 17 #include <type_traits> 18 #include <cassert> 19 20 struct B 21 { 22 static int count; 23 24 B() {++count;} 25 B(const B&) {++count;} 26 virtual ~B() {--count;} 27 }; 28 29 int B::count = 0; 30 31 struct A 32 : public B 33 { 34 static int count; 35 36 A() {++count;} 37 A(const A&) {++count;} 38 ~A() {--count;} 39 }; 40 41 int A::count = 0; 42 43 int main() 44 { 45 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 46 { 47 std::shared_ptr<A> pA(new A); 48 A* ptrA = pA.get(); 49 { 50 std::shared_ptr<B> pB(new B); 51 pB = std::move(pA); 52 assert(B::count == 1); 53 assert(A::count == 1); 54 assert(pB.use_count() == 1); 55 assert(pA.use_count() == 0); 56 assert(pA.get() == 0); 57 assert(pB.get() == ptrA); 58 } 59 assert(pA.use_count() == 0); 60 assert(B::count == 0); 61 assert(A::count == 0); 62 } 63 assert(B::count == 0); 64 assert(A::count == 0); 65 { 66 std::shared_ptr<A> pA; 67 A* ptrA = pA.get(); 68 { 69 std::shared_ptr<B> pB(new B); 70 pB = std::move(pA); 71 assert(B::count == 0); 72 assert(A::count == 0); 73 assert(pB.use_count() == 0); 74 assert(pA.use_count() == 0); 75 assert(pA.get() == 0); 76 assert(pB.get() == ptrA); 77 } 78 assert(pA.use_count() == 0); 79 assert(B::count == 0); 80 assert(A::count == 0); 81 } 82 assert(B::count == 0); 83 assert(A::count == 0); 84 { 85 std::shared_ptr<A> pA(new A); 86 A* ptrA = pA.get(); 87 { 88 std::shared_ptr<B> pB; 89 pB = std::move(pA); 90 assert(B::count == 1); 91 assert(A::count == 1); 92 assert(pB.use_count() == 1); 93 assert(pA.use_count() == 0); 94 assert(pA.get() == 0); 95 assert(pB.get() == ptrA); 96 } 97 assert(pA.use_count() == 0); 98 assert(B::count == 0); 99 assert(A::count == 0); 100 } 101 assert(B::count == 0); 102 assert(A::count == 0); 103 { 104 std::shared_ptr<A> pA; 105 A* ptrA = pA.get(); 106 { 107 std::shared_ptr<B> pB; 108 pB = std::move(pA); 109 assert(B::count == 0); 110 assert(A::count == 0); 111 assert(pB.use_count() == 0); 112 assert(pA.use_count() == 0); 113 assert(pA.get() == 0); 114 assert(pB.get() == ptrA); 115 } 116 assert(pA.use_count() == 0); 117 assert(B::count == 0); 118 assert(A::count == 0); 119 } 120 assert(B::count == 0); 121 assert(A::count == 0); 122 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 123 } 124
