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 // UNSUPPORTED: c++98, c++03 11 12 // <memory> 13 14 // shared_ptr 15 16 // template<class Y> shared_ptr(shared_ptr<Y>&& r); 17 18 #include <memory> 19 #include <type_traits> 20 #include <cassert> 21 22 #include "test_macros.h" 23 24 struct B 25 { 26 static int count; 27 28 B() {++count;} 29 B(const B&) {++count;} 30 virtual ~B() {--count;} 31 }; 32 33 int B::count = 0; 34 35 struct A 36 : public B 37 { 38 static int count; 39 40 A() {++count;} 41 A(const A&) {++count;} 42 ~A() {--count;} 43 }; 44 45 int A::count = 0; 46 47 struct C 48 { 49 static int count; 50 51 C() {++count;} 52 C(const C&) {++count;} 53 virtual ~C() {--count;} 54 }; 55 56 int C::count = 0; 57 58 int main() 59 { 60 static_assert(( std::is_convertible<std::shared_ptr<A>, std::shared_ptr<B> >::value), ""); 61 static_assert((!std::is_convertible<std::shared_ptr<B>, std::shared_ptr<A> >::value), ""); 62 static_assert((!std::is_convertible<std::shared_ptr<A>, std::shared_ptr<C> >::value), ""); 63 { 64 std::shared_ptr<A> pA(new A); 65 assert(pA.use_count() == 1); 66 assert(B::count == 1); 67 assert(A::count == 1); 68 { 69 B* p = pA.get(); 70 std::shared_ptr<B> pB(std::move(pA)); 71 assert(B::count == 1); 72 assert(A::count == 1); 73 #if TEST_STD_VER >= 11 74 assert(pB.use_count() == 1); 75 assert(pA.use_count() == 0); 76 #else 77 assert(pB.use_count() == 2); 78 assert(pA.use_count() == 2); 79 #endif 80 assert(p == pB.get()); 81 } 82 #if TEST_STD_VER >= 11 83 assert(pA.use_count() == 0); 84 assert(B::count == 0); 85 assert(A::count == 0); 86 #else 87 assert(pA.use_count() == 1); 88 assert(B::count == 1); 89 assert(A::count == 1); 90 #endif 91 } 92 assert(B::count == 0); 93 assert(A::count == 0); 94 { 95 std::shared_ptr<A> pA; 96 assert(pA.use_count() == 0); 97 assert(B::count == 0); 98 assert(A::count == 0); 99 { 100 std::shared_ptr<B> pB(pA); 101 assert(B::count == 0); 102 assert(A::count == 0); 103 assert(pB.use_count() == 0); 104 assert(pA.use_count() == 0); 105 assert(pA.get() == pB.get()); 106 } 107 assert(pA.use_count() == 0); 108 assert(B::count == 0); 109 assert(A::count == 0); 110 } 111 assert(B::count == 0); 112 assert(A::count == 0); 113 } 114
