b64f8b07c1
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@119395 91177308-0d34-0410-b5e6-96231b3b80d8
122 lines
2.9 KiB
C++
122 lines
2.9 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <memory>
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// shared_ptr
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// shared_ptr& operator=(const shared_ptr& r);
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#include <memory>
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#include <type_traits>
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#include <cassert>
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struct B
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{
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static int count;
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B() {++count;}
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B(const B&) {++count;}
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virtual ~B() {--count;}
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};
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int B::count = 0;
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struct A
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: public B
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{
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static int count;
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A() {++count;}
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A(const A&) {++count;}
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~A() {--count;}
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};
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int A::count = 0;
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int main()
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{
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{
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const std::shared_ptr<A> pA(new A);
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A* ptrA = pA.get();
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{
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std::shared_ptr<A> pB(new A);
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pB = pA;
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assert(B::count == 1);
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assert(A::count == 1);
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assert(pB.use_count() == 2);
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assert(pA.use_count() == 2);
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assert(pA.get() == pB.get());
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assert(pB.get() == ptrA);
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}
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assert(pA.use_count() == 1);
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assert(B::count == 1);
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assert(A::count == 1);
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}
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assert(B::count == 0);
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assert(A::count == 0);
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{
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const std::shared_ptr<A> pA;
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A* ptrA = pA.get();
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{
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std::shared_ptr<A> pB(new A);
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pB = pA;
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assert(B::count == 0);
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assert(A::count == 0);
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assert(pB.use_count() == 0);
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assert(pA.use_count() == 0);
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assert(pA.get() == pB.get());
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assert(pB.get() == ptrA);
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}
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assert(pA.use_count() == 0);
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assert(B::count == 0);
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assert(A::count == 0);
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}
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assert(B::count == 0);
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assert(A::count == 0);
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{
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const std::shared_ptr<A> pA(new A);
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A* ptrA = pA.get();
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{
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std::shared_ptr<A> pB;
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pB = pA;
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assert(B::count == 1);
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assert(A::count == 1);
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assert(pB.use_count() == 2);
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assert(pA.use_count() == 2);
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assert(pA.get() == pB.get());
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assert(pB.get() == ptrA);
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}
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assert(pA.use_count() == 1);
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assert(B::count == 1);
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assert(A::count == 1);
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}
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assert(B::count == 0);
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assert(A::count == 0);
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{
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const std::shared_ptr<A> pA;
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A* ptrA = pA.get();
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{
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std::shared_ptr<A> pB;
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pB = pA;
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assert(B::count == 0);
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assert(A::count == 0);
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assert(pB.use_count() == 0);
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assert(pA.use_count() == 0);
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assert(pA.get() == pB.get());
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assert(pB.get() == ptrA);
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}
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assert(pA.use_count() == 0);
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assert(B::count == 0);
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assert(A::count == 0);
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}
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assert(B::count == 0);
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assert(A::count == 0);
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}
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