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135 lines
4.2 KiB
135 lines
4.2 KiB
/* /////////////////////////////////////////////////////////////////////////
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* File: stlsoft/meta/yesno.hpp
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*
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* Purpose: yes / no classes.
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*
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* Created: 16th May 2005
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* Updated: 10th August 2009
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*
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* Home: http://stlsoft.org/
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*
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* Copyright (c) 2005-2009, Matthew Wilson and Synesis Software
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* - Neither the name(s) of Matthew Wilson and Synesis Software nor the names of
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* any contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* ////////////////////////////////////////////////////////////////////// */
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/** \file stlsoft/meta/yesno.hpp
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*
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* \brief [C++ only] Definition of the stlsoft::yes_type and
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* stlsoft::no_type meta boolean "constants"
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* (\ref group__library__meta "Template Meta-programming" Library).
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*/
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#ifndef STLSOFT_INCL_STLSOFT_META_HPP_YESNO
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#define STLSOFT_INCL_STLSOFT_META_HPP_YESNO
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#ifndef STLSOFT_DOCUMENTATION_SKIP_SECTION
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# define STLSOFT_VER_STLSOFT_META_HPP_YESNO_MAJOR 1
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# define STLSOFT_VER_STLSOFT_META_HPP_YESNO_MINOR 3
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# define STLSOFT_VER_STLSOFT_META_HPP_YESNO_REVISION 1
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# define STLSOFT_VER_STLSOFT_META_HPP_YESNO_EDIT 14
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#endif /* !STLSOFT_DOCUMENTATION_SKIP_SECTION */
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/* /////////////////////////////////////////////////////////////////////////
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* Includes
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*/
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#ifndef STLSOFT_INCL_STLSOFT_H_STLSOFT
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# include <stlsoft/stlsoft.h>
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#endif /* !STLSOFT_INCL_STLSOFT_H_STLSOFT */
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/* /////////////////////////////////////////////////////////////////////////
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* Namespace
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*/
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#ifndef _STLSOFT_NO_NAMESPACE
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namespace stlsoft
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{
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#endif /* _STLSOFT_NO_NAMESPACE */
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/* /////////////////////////////////////////////////////////////////////////
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* Classes
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*/
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/** \brief Meta boolean 'yes' type, which acts as a complement to the
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* \link stlsoft::no_type no_type\endlink.
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*
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* \ingroup group__library__meta
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*/
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struct yes_type
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{
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char ar[32];
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};
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/** \brief Meta boolean 'no' type, which acts as a complement to the
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* \link stlsoft::yes_type yes_type\endlink.
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*
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* \ingroup group__library__meta
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*/
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struct no_type
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{
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char ar[1];
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};
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/** \brief A type which translates a boolean (integral zero / non-zero)
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* value into the appropriate type (no_type / yes_type).
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*
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* \ingroup group__library__meta
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*/
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template <ss_bool_t B>
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struct value_to_yesno_type
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{
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enum { value = 1 };
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typedef yes_type type;
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};
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#ifndef STLSOFT_DOCUMENTATION_SKIP_SECTION
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STLSOFT_TEMPLATE_SPECIALISATION
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struct value_to_yesno_type<0>
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{
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enum { value = 0 };
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typedef no_type type;
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};
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#endif /* !STLSOFT_DOCUMENTATION_SKIP_SECTION */
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/* ////////////////////////////////////////////////////////////////////// */
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#ifndef _STLSOFT_NO_NAMESPACE
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} // namespace stlsoft
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#endif /* _STLSOFT_NO_NAMESPACE */
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/* ////////////////////////////////////////////////////////////////////// */
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#endif /* !STLSOFT_INCL_STLSOFT_META_HPP_YESNO */
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/* ///////////////////////////// end of file //////////////////////////// */
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