explicit_inheritance_veneer.hpp

用STL的方式封装了WindowsAPI、COM调用、ACE、ATL、MFC、WTL等多种组件

/* /////////////////////////////////////////////////////////////////////////
 * File:        stlsoft/explicit_inheritance_veneer.hpp (formerly stlsoft_explicit_inheritance_veneer.h)
 *
 * Purpose:     Explicit inheritance veneer class.
 *
 * Created:     13th January 2003
 * Updated:     10th June 2006
 *
 * Home:        http://stlsoft.org/
 *
 * Copyright (c) 2003-2006, Matthew Wilson and Synesis Software
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 * - Neither the name(s) of Matthew Wilson and Synesis Software nor the names of
 *   any contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * ////////////////////////////////////////////////////////////////////// */


/// \file stlsoft/explicit_inheritance_veneer.hpp (formerly stlsoft_explicit_inheritance_veneer.h)
///
/// Explicit inheritance veneer class.

#ifndef STLSOFT_INCL_STLSOFT_HPP_EXPLICIT_INHERITANCE_VENEER
#define STLSOFT_INCL_STLSOFT_HPP_EXPLICIT_INHERITANCE_VENEER

#ifndef STLSOFT_DOCUMENTATION_SKIP_SECTION
# define STLSOFT_VER_STLSOFT_HPP_EXPLICIT_INHERITANCE_VENEER_MAJOR      3
# define STLSOFT_VER_STLSOFT_HPP_EXPLICIT_INHERITANCE_VENEER_MINOR      1
# define STLSOFT_VER_STLSOFT_HPP_EXPLICIT_INHERITANCE_VENEER_REVISION   1
# define STLSOFT_VER_STLSOFT_HPP_EXPLICIT_INHERITANCE_VENEER_EDIT       29
#endif /* !STLSOFT_DOCUMENTATION_SKIP_SECTION */

/* /////////////////////////////////////////////////////////////////////////
 * Includes
 */

#ifndef STLSOFT_INCL_STLSOFT_H_STLSOFT
# include <stlsoft/stlsoft.h>
#endif /* !STLSOFT_INCL_STLSOFT_H_STLSOFT */
#ifndef STLSOFT_INCL_STLSOFT_HPP_CONSTRAINTS
# include <stlsoft/constraints.hpp>   // for must_be_same_size
#endif /* !STLSOFT_INCL_STLSOFT_HPP_CONSTRAINTS */

/* /////////////////////////////////////////////////////////////////////////
 * Namespace
 */

#ifndef _STLSOFT_NO_NAMESPACE
namespace stlsoft
{
#endif /* _STLSOFT_NO_NAMESPACE */

/* /////////////////////////////////////////////////////////////////////////
 * Classes
 */


// class explicit_inheritance_veneer

/// Applies a \c protected veneer over a type, which can be accessed only
/// through conversions to the veneered type
///
/// \param T The type to be subject to the veneer
///
/// \ingroup concepts_veneer
template <ss_typename_param_k T>
struct explicit_inheritance_veneer
    : protected T
{
public:
    /// The base class type
    typedef T   base_type;

// Conversion
public:
    /// The conversion operator that provides access to the base type
    base_type const *operator &() const
    {
        stlsoft_constraint_must_be_same_size(T, explicit_inheritance_veneer<T>);

        return this;
    }

// Implementation
protected:
    /// Access a mutable reference to the base type
    base_type &base_type_value()
    {
        return *this;
    }
    /// Access a non-mutable reference to the base type
    base_type const &base_type_value() const
    {
        return *this;
    }
};

////////////////////////////////////////////////////////////////////////////
// Unit-testing

#ifdef STLSOFT_UNITTEST

namespace unittest
{
    namespace
    {
        ss_bool_t test_stlsoft_explicit_inheritance_veneer(unittest_reporter *r)
        {
            ss_bool_t               bSuccess    =   true;

            unittest_initialiser    init(r, "STLSoft", "explicit_inheritance_veneer", __FILE__);

#if 0
            if(<<TODO>>)
            {
                r->report("<<TODO>> failed", __LINE__);
                bSuccess = false;
            }
#endif /* 0 */

            return bSuccess;
        }

        unittest_registrar    unittest_stlsoft_explicit_inheritance_veneer(test_stlsoft_explicit_inheritance_veneer);
    } // anonymous namespace

} // namespace unittest

#endif /* STLSOFT_UNITTEST */

/* ////////////////////////////////////////////////////////////////////// */

#ifndef _STLSOFT_NO_NAMESPACE
} // namespace stlsoft
#endif /* _STLSOFT_NO_NAMESPACE */

/* ////////////////////////////////////////////////////////////////////// */

#endif /* !STLSOFT_INCL_STLSOFT_HPP_EXPLICIT_INHERITANCE_VENEER */

/* ////////////////////////////////////////////////////////////////////// */