//===----------------------------------------------------------------------===//
//
//                     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 unique_ptr converting move ctor

#include <memory>
#include <utility>
#include <cassert>

// test converting move ctor.  Should only require a MoveConstructible deleter, or if
//    deleter is a reference, not even that.
// Explicit version

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;

template <class T>
class CDeleter
{
    int state_;

    CDeleter(CDeleter&);
    CDeleter& operator=(CDeleter&);
public:

    CDeleter() : state_(5) {}

    int state() const {return state_;}
    void set_state(int s) {state_ = s;}

    void operator()(T* p) {delete p;}
};

int main()
{
    {
    CDeleter<A> d;
    const std::unique_ptr<B, CDeleter<A>&> s(new B, d);
    A* p = s.get();
    std::unique_ptr<A, CDeleter<A>&> s2 = s;
    assert(s2.get() == p);
    assert(s.get() == 0);
    assert(A::count == 1);
    assert(B::count == 1);
    d.set_state(6);
    assert(s2.get_deleter().state() == d.state());
    assert(s.get_deleter().state() ==  d.state());
    }
    assert(A::count == 0);
    assert(B::count == 0);
}