cxx/test/utilities/memory/unique.ptr/unique.ptr.single/unique.ptr.single.asgn/move01.pass.cpp

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// <memory>

// unique_ptr

// Test unique_ptr move assignment

// test move assignment.  Should only require a MoveConstructible deleter, or if
//    deleter is a reference, not even that.

#include <memory>
#include <cassert>

#include "../../deleter.h"

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

int A::count = 0;

int main()
{
    {
    std::unique_ptr<A> s1(new A);
    A* p = s1.get();
    std::unique_ptr<A> s2(new A);
    assert(A::count == 2);
    s2 = std::move(s1);
    assert(A::count == 1);
    assert(s2.get() == p);
    assert(s1.get() == 0);
    }
    assert(A::count == 0);
    {
    std::unique_ptr<A, Deleter<A> > s1(new A, Deleter<A>(5));
    A* p = s1.get();
    std::unique_ptr<A, Deleter<A> > s2(new A);
    assert(A::count == 2);
    s2 = std::move(s1);
    assert(s2.get() == p);
    assert(s1.get() == 0);
    assert(A::count == 1);
    assert(s2.get_deleter().state() == 5);
    assert(s1.get_deleter().state() == 0);
    }
    assert(A::count == 0);
    {
    CDeleter<A> d1(5);
    std::unique_ptr<A, CDeleter<A>&> s1(new A, d1);
    A* p = s1.get();
    CDeleter<A> d2(6);
    std::unique_ptr<A, CDeleter<A>&> s2(new A, d2);
    s2 = std::move(s1);
    assert(s2.get() == p);
    assert(s1.get() == 0);
    assert(A::count == 1);
    assert(d1.state() == 5);
    assert(d2.state() == 5);
    }
    assert(A::count == 0);
}