is_pointer_type.hpp

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

/* /////////////////////////////////////////////////////////////////////////
 * File:        stlsoft/meta/is_pointer_type.hpp (formerly part of stlsoft_meta.h)
 *
 * Purpose:     Tests whether a type is a pointer.
 *
 * Created:     19th November 1998
 * Updated:     10th June 2006
 *
 * Home:        http://stlsoft.org/
 *
 * Copyright (c) 1998-2006, 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/meta/is_pointer_type.hpp
///
/// Tests whether a type is a pointer.

#ifndef STLSOFT_INCL_STLSOFT_META_HPP_IS_POINTER_TYPE
#define STLSOFT_INCL_STLSOFT_META_HPP_IS_POINTER_TYPE

#ifndef STLSOFT_DOCUMENTATION_SKIP_SECTION
# define STLSOFT_VER_STLSOFT_META_HPP_IS_POINTER_TYPE_MAJOR       4
# define STLSOFT_VER_STLSOFT_META_HPP_IS_POINTER_TYPE_MINOR       0
# define STLSOFT_VER_STLSOFT_META_HPP_IS_POINTER_TYPE_REVISION    1
# define STLSOFT_VER_STLSOFT_META_HPP_IS_POINTER_TYPE_EDIT        112
#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_META_HPP_N_TYPES
# include <stlsoft/meta/n_types.hpp>
#endif /* !STLSOFT_INCL_STLSOFT_META_HPP_N_TYPES */

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

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

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

// is_pointer_type
//
/// Tests whether a type is a pointer type

template <ss_typename_param_k U>
one_t is_pointer_type_func(U const volatile *);

two_t is_pointer_type_func(...);

/// traits type used to determine whether the given type is a pointer
template <ss_typename_param_k T>
struct is_pointer_type
{
    typedef T   test_type;

private:
    static T    t;
public:
    enum { value = sizeof(is_pointer_type_func(t)) == sizeof(one_t) };
};

#ifndef STLSOFT_DOCUMENTATION_SKIP_SECTION

STLSOFT_TEMPLATE_SPECIALISATION
struct is_pointer_type<void>
{
    enum { value = 0 };
};

#endif /* !STLSOFT_DOCUMENTATION_SKIP_SECTION */

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

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

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

#endif /* !STLSOFT_INCL_STLSOFT_META_HPP_IS_POINTER_TYPE */

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