| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <memory> |
| |
| // shared_ptr |
| |
| // void swap(shared_ptr& r); |
| |
| #include <memory> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| |
| struct A |
| { |
| static int count; |
| |
| A() {++count;} |
| A(const A&) {++count;} |
| ~A() {--count;} |
| }; |
| |
| int A::count = 0; |
| |
| int main(int, char**) |
| { |
| { |
| A* ptr1 = new A; |
| A* ptr2 = new A; |
| std::shared_ptr<A> p1(ptr1); |
| { |
| std::shared_ptr<A> p2(ptr2); |
| p1.swap(p2); |
| assert(p1.use_count() == 1); |
| assert(p1.get() == ptr2); |
| assert(p2.use_count() == 1); |
| assert(p2.get() == ptr1); |
| assert(A::count == 2); |
| } |
| assert(p1.use_count() == 1); |
| assert(p1.get() == ptr2); |
| assert(A::count == 1); |
| } |
| assert(A::count == 0); |
| { |
| A* ptr1 = new A; |
| A* ptr2 = 0; |
| std::shared_ptr<A> p1(ptr1); |
| { |
| std::shared_ptr<A> p2; |
| p1.swap(p2); |
| assert(p1.use_count() == 0); |
| assert(p1.get() == ptr2); |
| assert(p2.use_count() == 1); |
| assert(p2.get() == ptr1); |
| assert(A::count == 1); |
| } |
| assert(p1.use_count() == 0); |
| assert(p1.get() == ptr2); |
| assert(A::count == 0); |
| } |
| assert(A::count == 0); |
| { |
| A* ptr1 = 0; |
| A* ptr2 = new A; |
| std::shared_ptr<A> p1; |
| { |
| std::shared_ptr<A> p2(ptr2); |
| p1.swap(p2); |
| assert(p1.use_count() == 1); |
| assert(p1.get() == ptr2); |
| assert(p2.use_count() == 0); |
| assert(p2.get() == ptr1); |
| assert(A::count == 1); |
| } |
| assert(p1.use_count() == 1); |
| assert(p1.get() == ptr2); |
| assert(A::count == 1); |
| } |
| assert(A::count == 0); |
| { |
| A* ptr1 = 0; |
| A* ptr2 = 0; |
| std::shared_ptr<A> p1; |
| { |
| std::shared_ptr<A> p2; |
| p1.swap(p2); |
| assert(p1.use_count() == 0); |
| assert(p1.get() == ptr2); |
| assert(p2.use_count() == 0); |
| assert(p2.get() == ptr1); |
| assert(A::count == 0); |
| } |
| assert(p1.use_count() == 0); |
| assert(p1.get() == ptr2); |
| assert(A::count == 0); |
| } |
| assert(A::count == 0); |
| |
| return 0; |
| } |