examples/manual/auto_ptr.cpp

/**************************************************************************
 *
 * auto_ptr.cpp - Example program of auto_ptr.
 *
 * $Id: //stdlib/dev/examples/stdlib/manual/auto_ptr.cpp#10 $
 *
 ***************************************************************************
 *
 * Copyright (c) 1994-2005 Quovadx,  Inc., acting through its  Rogue Wave
 * Software division. Licensed under the Apache License, Version 2.0 (the
 * "License");  you may  not use this file except  in compliance with the
 * License.    You    may   obtain   a   copy   of    the   License    at
 * http://www.apache.org/licenses/LICENSE-2.0.    Unless   required    by
 * applicable law  or agreed to  in writing,  software  distributed under
 * the License is distributed on an "AS IS" BASIS,  WITHOUT WARRANTIES OR
 * CONDITIONS OF  ANY KIND, either  express or implied.  See  the License
 * for the specific language governing permissions  and limitations under
 * the License.
 * 
 **************************************************************************/

#include <iostream>   // for cout, endl
#include <memory>     // for auto_ptr

#include <examples.h>


// A simple structure.
class X
{
    int i_;

public:

    X (int i) : i_ (i) {
        std::cout << "X::X (" << i_ << ')' << std::endl;
    }

    ~X () {
        std::cout << "X::~X [" << i_ << ']' << std::endl;
    }

    int get () const { return i_; }
};


int main ()
{
    // a implicitly initialized to 0 (the null pointer)
    std::auto_ptr<X> a;

    // Establish a scope.
    if (1) {
        // b will hold a pointer to an X.
        std::auto_ptr<X> b (new X (12345));

        // a will now be the owner of the underlying pointer.
        a = b;
    }

    std::cout << "b destroyed" << std::endl;

        // Output the value contained by the underlying pointer.
#ifndef _RWSTD_NO_NONCLASS_ARROW_RETURN
        std::cout << a->get () << std::endl;
#else
        std::cout << (*a).get () << std::endl;
#endif

    // The pointer will be delete'd when a is destroyed on leaving scope.
    return 0;
}