shared_ptr_Y_rv.pass.cpp revision c52f43e72dfcea03037729649da84c23b3beb04a
1//===----------------------------------------------------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9 10// <memory> 11 12// shared_ptr 13 14// template<class Y> shared_ptr(shared_ptr<Y>&& r); 15 16#include <memory> 17#include <type_traits> 18#include <cassert> 19 20struct B 21{ 22 static int count; 23 24 B() {++count;} 25 B(const B&) {++count;} 26 virtual ~B() {--count;} 27}; 28 29int B::count = 0; 30 31struct A 32 : public B 33{ 34 static int count; 35 36 A() {++count;} 37 A(const A&) {++count;} 38 ~A() {--count;} 39}; 40 41int A::count = 0; 42 43struct C 44{ 45 static int count; 46 47 C() {++count;} 48 C(const C&) {++count;} 49 virtual ~C() {--count;} 50}; 51 52int C::count = 0; 53 54int main() 55{ 56 static_assert(( std::is_convertible<std::shared_ptr<A>, std::shared_ptr<B> >::value), ""); 57 static_assert((!std::is_convertible<std::shared_ptr<B>, std::shared_ptr<A> >::value), ""); 58 static_assert((!std::is_convertible<std::shared_ptr<A>, std::shared_ptr<C> >::value), ""); 59 { 60 std::shared_ptr<A> pA(new A); 61 assert(pA.use_count() == 1); 62 assert(B::count == 1); 63 assert(A::count == 1); 64 { 65 B* p = pA.get(); 66 std::shared_ptr<B> pB(std::move(pA)); 67 assert(B::count == 1); 68 assert(A::count == 1); 69#ifdef _LIBCPP_MOVE 70 assert(pB.use_count() == 1); 71 assert(pA.use_count() == 0); 72#else // _LIBCPP_MOVE 73 assert(pB.use_count() == 2); 74 assert(pA.use_count() == 2); 75#endif // _LIBCPP_MOVE 76 assert(p == pB.get()); 77 } 78#ifdef _LIBCPP_MOVE 79 assert(pA.use_count() == 0); 80 assert(B::count == 0); 81 assert(A::count == 0); 82#else // _LIBCPP_MOVE 83 assert(pA.use_count() == 1); 84 assert(B::count == 1); 85 assert(A::count == 1); 86#endif // _LIBCPP_MOVE 87 } 88 assert(B::count == 0); 89 assert(A::count == 0); 90 { 91 std::shared_ptr<A> pA; 92 assert(pA.use_count() == 0); 93 assert(B::count == 0); 94 assert(A::count == 0); 95 { 96 std::shared_ptr<B> pB(pA); 97 assert(B::count == 0); 98 assert(A::count == 0); 99 assert(pB.use_count() == 0); 100 assert(pA.use_count() == 0); 101 assert(pA.get() == pB.get()); 102 } 103 assert(pA.use_count() == 0); 104 assert(B::count == 0); 105 assert(A::count == 0); 106 } 107 assert(B::count == 0); 108 assert(A::count == 0); 109} 110