explicit_inheritance_veneer.hpp

新版本TR1的stl

/* /////////////////////////////////////////////////////////////////////////
 * File:        stlsoft/obsolete/explicit_inheritance_veneer.hpp
 *
 * Purpose:     Explicit inheritance veneer class.
 *
 * Created:     13th January 2003
 * Updated:     12th March 2007
 *
 * Home:        http://stlsoft.org/
 *
 * Copyright (c) 2003-2007, 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/obsolete/explicit_inheritance_veneer.hpp
///
/// Explicit inheritance veneer class.

#ifndef STLSOFT_INCL_STLSOFT_OBSOLETE_HPP_EXPLICIT_INHERITANCE_VENEER
#define STLSOFT_INCL_STLSOFT_OBSOLETE_HPP_EXPLICIT_INHERITANCE_VENEER

#ifndef STLSOFT_DOCUMENTATION_SKIP_SECTION
# define STLSOFT_VER_STLSOFT_OBSOLETE_HPP_EXPLICIT_INHERITANCE_VENEER_MAJOR      4
# define STLSOFT_VER_STLSOFT_OBSOLETE_HPP_EXPLICIT_INHERITANCE_VENEER_MINOR      0
# define STLSOFT_VER_STLSOFT_OBSOLETE_HPP_EXPLICIT_INHERITANCE_VENEER_REVISION   2
# define STLSOFT_VER_STLSOFT_OBSOLETE_HPP_EXPLICIT_INHERITANCE_VENEER_EDIT       36
#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_UTIL_HPP_CONSTRAINTS
# include <stlsoft/util/constraints.hpp>
#endif /* !STLSOFT_INCL_STLSOFT_UTIL_HPP_CONSTRAINTS */

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

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

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


// class explicit_inheritance_veneer

/** \brief 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 group__library__obsolete
 *
 */
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;
    }
};

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

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

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

#endif /* !STLSOFT_INCL_STLSOFT_OBSOLETE_HPP_EXPLICIT_INHERITANCE_VENEER */

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