111cd02dfb91661c65134cac258cf5924270e9d2Dan Albert//===----------------------------------------------------------------------===// 211cd02dfb91661c65134cac258cf5924270e9d2Dan Albert// 311cd02dfb91661c65134cac258cf5924270e9d2Dan Albert// The LLVM Compiler Infrastructure 411cd02dfb91661c65134cac258cf5924270e9d2Dan Albert// 511cd02dfb91661c65134cac258cf5924270e9d2Dan Albert// This file is dual licensed under the MIT and the University of Illinois Open 611cd02dfb91661c65134cac258cf5924270e9d2Dan Albert// Source Licenses. See LICENSE.TXT for details. 711cd02dfb91661c65134cac258cf5924270e9d2Dan Albert// 811cd02dfb91661c65134cac258cf5924270e9d2Dan Albert//===----------------------------------------------------------------------===// 911cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 1011cd02dfb91661c65134cac258cf5924270e9d2Dan Albert// <memory> 1111cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 1211cd02dfb91661c65134cac258cf5924270e9d2Dan Albert// weak_ptr 1311cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 1411cd02dfb91661c65134cac258cf5924270e9d2Dan Albert// shared_ptr<T> lock() const; 1511cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 1611cd02dfb91661c65134cac258cf5924270e9d2Dan Albert#include <memory> 1711cd02dfb91661c65134cac258cf5924270e9d2Dan Albert#include <cassert> 1811cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 1911cd02dfb91661c65134cac258cf5924270e9d2Dan Albertstruct A 2011cd02dfb91661c65134cac258cf5924270e9d2Dan Albert{ 2111cd02dfb91661c65134cac258cf5924270e9d2Dan Albert static int count; 2211cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 2311cd02dfb91661c65134cac258cf5924270e9d2Dan Albert A() {++count;} 2411cd02dfb91661c65134cac258cf5924270e9d2Dan Albert A(const A&) {++count;} 2511cd02dfb91661c65134cac258cf5924270e9d2Dan Albert ~A() {--count;} 2611cd02dfb91661c65134cac258cf5924270e9d2Dan Albert}; 2711cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 2811cd02dfb91661c65134cac258cf5924270e9d2Dan Albertint A::count = 0; 2911cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 3011cd02dfb91661c65134cac258cf5924270e9d2Dan Albertint main() 3111cd02dfb91661c65134cac258cf5924270e9d2Dan Albert{ 3211cd02dfb91661c65134cac258cf5924270e9d2Dan Albert { 3311cd02dfb91661c65134cac258cf5924270e9d2Dan Albert std::weak_ptr<A> wp; 3411cd02dfb91661c65134cac258cf5924270e9d2Dan Albert std::shared_ptr<A> sp = wp.lock(); 3511cd02dfb91661c65134cac258cf5924270e9d2Dan Albert assert(sp.use_count() == 0); 3611cd02dfb91661c65134cac258cf5924270e9d2Dan Albert assert(sp.get() == 0); 3711cd02dfb91661c65134cac258cf5924270e9d2Dan Albert assert(A::count == 0); 3811cd02dfb91661c65134cac258cf5924270e9d2Dan Albert } 3911cd02dfb91661c65134cac258cf5924270e9d2Dan Albert { 4011cd02dfb91661c65134cac258cf5924270e9d2Dan Albert std::shared_ptr<A> sp0(new A); 4111cd02dfb91661c65134cac258cf5924270e9d2Dan Albert std::weak_ptr<A> wp(sp0); 4211cd02dfb91661c65134cac258cf5924270e9d2Dan Albert std::shared_ptr<A> sp = wp.lock(); 4311cd02dfb91661c65134cac258cf5924270e9d2Dan Albert assert(sp.use_count() == 2); 4411cd02dfb91661c65134cac258cf5924270e9d2Dan Albert assert(sp.get() == sp0.get()); 4511cd02dfb91661c65134cac258cf5924270e9d2Dan Albert assert(A::count == 1); 4611cd02dfb91661c65134cac258cf5924270e9d2Dan Albert } 4711cd02dfb91661c65134cac258cf5924270e9d2Dan Albert assert(A::count == 0); 4811cd02dfb91661c65134cac258cf5924270e9d2Dan Albert { 4911cd02dfb91661c65134cac258cf5924270e9d2Dan Albert std::shared_ptr<A> sp0(new A); 5011cd02dfb91661c65134cac258cf5924270e9d2Dan Albert std::weak_ptr<A> wp(sp0); 5111cd02dfb91661c65134cac258cf5924270e9d2Dan Albert sp0.reset(); 5211cd02dfb91661c65134cac258cf5924270e9d2Dan Albert std::shared_ptr<A> sp = wp.lock(); 5311cd02dfb91661c65134cac258cf5924270e9d2Dan Albert assert(sp.use_count() == 0); 5411cd02dfb91661c65134cac258cf5924270e9d2Dan Albert assert(sp.get() == 0); 5511cd02dfb91661c65134cac258cf5924270e9d2Dan Albert assert(A::count == 0); 5611cd02dfb91661c65134cac258cf5924270e9d2Dan Albert } 5711cd02dfb91661c65134cac258cf5924270e9d2Dan Albert assert(A::count == 0); 5811cd02dfb91661c65134cac258cf5924270e9d2Dan Albert} 59