ret_conv.cpp

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C++ 代码 · 共 82 行

/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
*    Public License version 1.0 (the 'License'). You may not use this file
*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
*    provided with the Original Code and Modifications, and is also
*    available at www.sybase.com/developer/opensource.
*
*    The Original Code and all software distributed under the License are
*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
*    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
*    NON-INFRINGEMENT. Please see the License for the specific language
*    governing rights and limitations under the License.
*
*  ========================================================================
*
* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
*               DESCRIBE IT HERE!
*
****************************************************************************/


#include <iostream.h>

struct V {
    int v;
    V( int );
};

V::V( int x ) : v(x) {
}

struct DV : virtual V {
    int dv;
    DV( int );
};

DV::DV( int x ) : dv(x), V(x+1) {
}

struct B {
    virtual V *foo();
};

V *B::foo()
{
    return new V(1);
}

struct D : B {
    virtual DV *foo();
};

DV *D::foo()
{
    return new DV(10);
}

void foo( B &r )
{
    V *p = r.foo();

    cout << "should be 11: " << p->v << endl;
}

void main()
{
    D x;

    foo( x );
}