cxx/test/utilities/memory/unique.ptr/unique.ptr.single/unique.ptr.single.modifiers/reset2.pass.cpp

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// <memory>

// unique_ptr

// test reset

#include <memory>
#include <cassert>

struct A
{
    static int count;
    A() {++count;}
    A(const A&) {++count;}
    virtual ~A() {--count;}
};

int A::count = 0;

struct B
    : public A
{
    static int count;
    B() {++count;}
    B(const B&) {++count;}
    virtual ~B() {--count;}
};

int B::count = 0;

int main()
{
    {
    std::unique_ptr<A> p(new A);
    assert(A::count == 1);
    assert(B::count == 0);
    A* i = p.get();
    p.reset(new B);
    assert(A::count == 1);
    assert(B::count == 1);
    }
    assert(A::count == 0);
    assert(B::count == 0);
    {
    std::unique_ptr<A> p(new B);
    assert(A::count == 1);
    assert(B::count == 1);
    A* i = p.get();
    p.reset(new B);
    assert(A::count == 1);
    assert(B::count == 1);
    }
    assert(A::count == 0);
    assert(B::count == 0);
}