string_traits.hpp

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

/* /////////////////////////////////////////////////////////////////////////
 * File:        stlsoft/string/string_traits.hpp (originally stlsoft_string_traits.h)
 *
 * Purpose:     string_traits traits class.
 *
 * Created:     16th January 2002
 * Updated:     10th June 2006
 *
 * Home:        http://stlsoft.org/
 *
 * Copyright (c) 2002-2006, 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/string/string_traits.hpp
 *
 * \brief [C++ only] Definition of the stlsoft::string_traits traits class.
 *  (\ref group__library__string "String" Library.)
 */

#ifndef STLSOFT_INCL_STLSOFT_STRING_HPP_STRING_TRAITS
#define STLSOFT_INCL_STLSOFT_STRING_HPP_STRING_TRAITS

#ifndef STLSOFT_DOCUMENTATION_SKIP_SECTION
# define STLSOFT_VER_STLSOFT_STRING_HPP_STRING_TRAITS_MAJOR     4
# define STLSOFT_VER_STLSOFT_STRING_HPP_STRING_TRAITS_MINOR     0
# define STLSOFT_VER_STLSOFT_STRING_HPP_STRING_TRAITS_REVISION  1
# define STLSOFT_VER_STLSOFT_STRING_HPP_STRING_TRAITS_EDIT      68
#endif /* !STLSOFT_DOCUMENTATION_SKIP_SECTION */

/* /////////////////////////////////////////////////////////////////////////
 * Compatibility
 */

/*
[Incompatibilies-start]
[Incompatibilies-end]
 */

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

#ifndef STLSOFT_INCL_STLSOFT_H_STLSOFT
# include <stlsoft/stlsoft.h>
#endif /* !STLSOFT_INCL_STLSOFT_H_STLSOFT */
#ifndef STLSOFT_INCL_STLSOFT_STRING_HPP_CHAR_TRAITS
# include <stlsoft/string/char_traits.hpp>
#endif /* !STLSOFT_INCL_STLSOFT_STRING_HPP_CHAR_TRAITS */
#ifndef STLSOFT_INCL_STLSOFT_STRING_HPP_STRING_TRAITS_FWD
# include <stlsoft/string/string_traits_fwd.hpp>
#endif /* !STLSOFT_INCL_STLSOFT_STRING_HPP_STRING_TRAITS_FWD */
#ifndef _STLSOFT_STRING_TRAITS_NO_STD_STRING
# include <string>
#endif /* _STLSOFT_STRING_TRAITS_NO_STD_STRING */

#ifdef STLSOFT_UNITTEST
# include <string>
# include <stlsoft/meta.hpp>
# include <stlsoft/meta/base_type_traits.hpp>
#endif /* STLSOFT_UNITTEST */

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

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

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

#ifndef STLSOFT_DOCUMENTATION_SKIP_SECTION

/* C-style ANSI string */
STLSOFT_TEMPLATE_SPECIALISATION
struct string_traits<ss_char_a_t *>
{
    typedef ss_char_a_t             value_type;
    typedef ss_char_a_t             char_type;
    typedef ss_size_t               size_type;
    typedef char_type const         const_char_type;
    typedef value_type const        *string_type;
    typedef value_type              *pointer;
    typedef value_type const        *const_pointer;
    enum {  is_pointer          =   true                };
    enum {  is_pointer_to_const =   false               };
    enum {  char_type_size      =   sizeof(char_type)   };

    static string_type empty_string()
    {
        // This character array is initialised to 0, which conveniently happens to
        // be the empty string, by the module/application load, so it is
        // guaranteed to be valid, and there are no threading/race conditions
        static char_type    s_empty[1];

        STLSOFT_ASSERT(s_empty[0] == '\0'); // Paranoid check

        return s_empty;
    }
};

STLSOFT_TEMPLATE_SPECIALISATION
struct string_traits<ss_char_a_t const *>
{
    typedef ss_char_a_t             value_type;
    typedef ss_char_a_t             char_type;
    typedef ss_size_t               size_type;
    typedef char_type const         const_char_type;
    typedef value_type const        *string_type;
    typedef value_type              *pointer;
    typedef value_type const        *const_pointer;
    enum {  is_pointer          =   true                };
    enum {  is_pointer_to_const =   false               };
    enum {  char_type_size      =   sizeof(char_type)   };

    static string_type empty_string()
    {
        // This character array is initialised to 0, which conveniently happens to
        // be the empty string, by the module/application load, so it is
        // guaranteed to be valid, and there are no threading/race conditions
        static char_type    s_empty[1];

        STLSOFT_ASSERT(s_empty[0] == '\0'); // Paranoid check

        return s_empty;
    }
};


#if 0
#ifdef STLSOFT_CF_STATIC_ARRAY_SIZE_DETERMINATION_SUPPORT
# if 1

template <ss_size_t N>
struct string_traits<ss_char_a_t const (&)[N]>
    : public string_traits<ss_char_a_t const *>
{};

template <ss_size_t N>
struct string_traits<ss_char_a_t (&)[N]>
    : public string_traits<ss_char_a_t *>
{};

STLSOFT_TEMPLATE_SPECIALISATION
struct string_traits<ss_char_a_t const []>
    : public string_traits<ss_char_a_t const *>
{};

STLSOFT_TEMPLATE_SPECIALISATION
struct string_traits<ss_char_a_t []>
    : public string_traits<ss_char_a_t *>
{};

# else /* ? 0 */

template <ss_typename_param_k C, ss_size_t N>
struct string_traits<C (&)[N]>
    : public string_traits<C *>
{
    typedef ss_char_a_t             value_type;
    typedef ss_char_a_t             char_type;
    typedef ss_size_t               size_type;
    typedef char_type const         const_char_type;
    typedef value_type const        *string_type;
    typedef value_type              *pointer;
    typedef value_type const        *const_pointer;
};

template <ss_typename_param_k C, ss_size_t N>
struct string_traits<C const (&)[N]>
    : public string_traits<C const *>
{
    typedef ss_char_a_t             value_type;
    typedef ss_char_a_t             char_type;
    typedef ss_size_t               size_type;
    typedef char_type const         const_char_type;
    typedef value_type const        *string_type;
    typedef value_type              *pointer;
    typedef value_type const        *const_pointer;
};

# endif /* 0 */
#endif /* STLSOFT_CF_STATIC_ARRAY_SIZE_DETERMINATION_SUPPORT */