1c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant//===----------------------------------------------------------------------===// 2c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// 3c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// The LLVM Compiler Infrastructure 4c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// 5b64f8b07c104c6cc986570ac8ee0ed16a9f23976Howard Hinnant// This file is dual licensed under the MIT and the University of Illinois Open 6b64f8b07c104c6cc986570ac8ee0ed16a9f23976Howard Hinnant// Source Licenses. See LICENSE.TXT for details. 7c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// 8c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant//===----------------------------------------------------------------------===// 9c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 10c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// <memory> 11c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 12c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// shared_ptr 13c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 14c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant// template<class T> void swap(shared_ptr<T>& a, shared_ptr<T>& b); 15c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 16c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant#include <memory> 17c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant#include <cassert> 18c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 19c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnantstruct A 20c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant{ 21c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant static int count; 22c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 23c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant A() {++count;} 24c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant A(const A&) {++count;} 25c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant ~A() {--count;} 26c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant}; 27c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 28c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnantint A::count = 0; 29c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant 30c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnantint main() 31c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant{ 32c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant { 33c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant A* ptr1 = new A; 34c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant A* ptr2 = new A; 35c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant std::shared_ptr<A> p1(ptr1); 36c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant { 37c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant std::shared_ptr<A> p2(ptr2); 38c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant swap(p1, p2); 39c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(p1.use_count() == 1); 40c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(p1.get() == ptr2); 41c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(p2.use_count() == 1); 42c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(p2.get() == ptr1); 43c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(A::count == 2); 44c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant } 45c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(p1.use_count() == 1); 46c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(p1.get() == ptr2); 47c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(A::count == 1); 48c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant } 49c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(A::count == 0); 50c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant { 51c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant A* ptr1 = new A; 52c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant A* ptr2 = 0; 53c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant std::shared_ptr<A> p1(ptr1); 54c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant { 55c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant std::shared_ptr<A> p2; 56c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant swap(p1, p2); 57c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(p1.use_count() == 0); 58c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(p1.get() == ptr2); 59c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(p2.use_count() == 1); 60c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(p2.get() == ptr1); 61c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(A::count == 1); 62c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant } 63c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(p1.use_count() == 0); 64c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(p1.get() == ptr2); 65c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(A::count == 0); 66c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant } 67c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(A::count == 0); 68c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant { 69c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant A* ptr1 = 0; 70c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant A* ptr2 = new A; 71c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant std::shared_ptr<A> p1; 72c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant { 73c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant std::shared_ptr<A> p2(ptr2); 74c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant swap(p1, p2); 75c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(p1.use_count() == 1); 76c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(p1.get() == ptr2); 77c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(p2.use_count() == 0); 78c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(p2.get() == ptr1); 79c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(A::count == 1); 80c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant } 81c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(p1.use_count() == 1); 82c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(p1.get() == ptr2); 83c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(A::count == 1); 84c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant } 85c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(A::count == 0); 86c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant { 87c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant A* ptr1 = 0; 88c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant A* ptr2 = 0; 89c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant std::shared_ptr<A> p1; 90c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant { 91c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant std::shared_ptr<A> p2; 92c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant swap(p1, p2); 93c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(p1.use_count() == 0); 94c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(p1.get() == ptr2); 95c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(p2.use_count() == 0); 96c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(p2.get() == ptr1); 97c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(A::count == 0); 98c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant } 99c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(p1.use_count() == 0); 100c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(p1.get() == ptr2); 101c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(A::count == 0); 102c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant } 103c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant assert(A::count == 0); 104c52f43e72dfcea03037729649da84c23b3beb04aHoward Hinnant} 105