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680 lines
21 KiB
680 lines
21 KiB
/* /////////////////////////////////////////////////////////////////////////
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* File: stlsoft/obsolete/conversion_veneer.hpp
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*
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* Purpose: Raw conversion veneer class.
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*
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* Created: 30th July 2002
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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) 2002-2009, 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/obsolete/conversion_veneer.hpp
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///
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/// Raw conversion veneer class.
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#ifndef STLSOFT_INCL_STLSOFT_OBSOLETE_HPP_CONVERSION_VENEER
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#define STLSOFT_INCL_STLSOFT_OBSOLETE_HPP_CONVERSION_VENEER
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#ifndef STLSOFT_DOCUMENTATION_SKIP_SECTION
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# define STLSOFT_VER_STLSOFT_OBSOLETE_HPP_CONVERSION_VENEER_MAJOR 3
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# define STLSOFT_VER_STLSOFT_OBSOLETE_HPP_CONVERSION_VENEER_MINOR 2
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# define STLSOFT_VER_STLSOFT_OBSOLETE_HPP_CONVERSION_VENEER_REVISION 2
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# define STLSOFT_VER_STLSOFT_OBSOLETE_HPP_CONVERSION_VENEER_EDIT 47
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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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#ifndef STLSOFT_INCL_STLSOFT_UTIL_HPP_CONSTRAINTS
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# include <stlsoft/util/constraints.hpp>
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#endif /* !STLSOFT_INCL_STLSOFT_UTIL_HPP_CONSTRAINTS */
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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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// class invalid_conversion
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/** \brief Prevents any conversion
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*
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* \ingroup group__library__obsolete
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*
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* \param T The value type
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* \param C The conversion type
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*/
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template< ss_typename_param_k T
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, ss_typename_param_k C
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>
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struct invalid_conversion
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{
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protected:
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/// The invalid type
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typedef void invalid_type;
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public:
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/// The value type
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typedef T value_type;
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/// The conversion type
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typedef C conversion_type;
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public:
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/// Converts a pointer to the \c value_type to a pointer to the \c conversion_type
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static invalid_type convert_pointer(value_type * /* pv */)
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{}
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/// Converts a pointer-to-const to the \c value_type to a pointer-to-const to the \c conversion_type
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static invalid_type convert_const_pointer(value_type const* /* pv */)
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{}
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/// Converts a reference to the \c value_type to a reference to the \c conversion_type
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static invalid_type convert_reference(value_type &/* v */)
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{}
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/// Converts a reference-to-const to the \c value_type to a reference-to-const to the \c conversion_type
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static invalid_type convert_const_reference(value_type const& /* v */)
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{}
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/// Pointer conversion type
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struct pointer_conversion
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{
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invalid_type operator ()(value_type * /* pv */)
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{}
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};
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/// Pointer-to-const conversion type
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struct pointer_const_conversion
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{
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invalid_type operator ()(value_type const* /* pv */)
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{}
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};
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/// Reference conversion type
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struct reference_conversion
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{
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invalid_type operator ()(value_type &/* v */)
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{}
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};
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/// Reference-to-const conversion type
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struct reference_const_conversion
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{
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invalid_type operator ()(value_type const& /* v */)
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{}
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};
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};
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// class static_conversion
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/** \brief Implements conversion via C++'s <code>static_cast</code>
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*
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* \ingroup group__library__obsolete
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*
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* \param T The value type
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* \param C The conversion type
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*/
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template< ss_typename_param_k T
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, ss_typename_param_k C
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>
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struct static_conversion
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{
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public:
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/// The value type
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typedef T value_type;
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/// The conversion type
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typedef C conversion_type;
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public:
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/// Converts a pointer to the \c value_type to a pointer to the \c conversion_type
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static conversion_type *convert_pointer(value_type *pv)
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{
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return static_cast<conversion_type*>(pv);
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}
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/// Converts a pointer-to-const to the \c value_type to a pointer-to-const to the \c conversion_type
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static conversion_type const* convert_const_pointer(value_type const* pv)
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{
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return static_cast<conversion_type const*>(pv);
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}
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/// Converts a reference to the \c value_type to a reference to the \c conversion_type
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static conversion_type &convert_reference(value_type &v)
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{
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return static_cast<conversion_type&>(v);
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}
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/// Converts a reference-to-const to the \c value_type to a reference-to-const to the \c conversion_type
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static conversion_type const& convert_const_reference(value_type const& v)
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{
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return static_cast<conversion_type const&>(v);
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}
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/// Pointer conversion type
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struct pointer_conversion
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{
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conversion_type *operator ()(value_type *pv)
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{
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return convert_pointer(pv);
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}
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};
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/// Pointer-to-const conversion type
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struct pointer_const_conversion
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{
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conversion_type const* operator ()(value_type const* pv)
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{
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return convert_const_pointer(pv);
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}
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};
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/// Reference conversion type
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struct reference_conversion
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{
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conversion_type& operator ()(value_type &v)
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{
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return convert_reference(v);
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}
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};
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/// Reference-to-const conversion type
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struct reference_const_conversion
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{
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conversion_type const& operator ()(value_type const& v)
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{
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return convert_const_reference(v);
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}
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};
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};
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// class dynamic_conversion
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/** \brief Implements conversion via C++'s <code>dynamic_cast</code>
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*
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* \ingroup group__library__obsolete
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*
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* \param T The value type
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* \param C The conversion type
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*/
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template< ss_typename_param_k T
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, ss_typename_param_k C
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>
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struct dynamic_conversion
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{
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public:
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/// The value type
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typedef T value_type;
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/// The conversion type
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typedef C conversion_type;
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public:
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/// Converts a pointer to the \c value_type to a pointer to the \c conversion_type
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static conversion_type *convert_pointer(value_type *pv)
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{
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return dynamic_cast<conversion_type*>(pv);
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}
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/// Converts a pointer-to-const to the \c value_type to a pointer-to-const to the \c conversion_type
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static conversion_type const* convert_const_pointer(value_type const* pv)
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{
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return dynamic_cast<conversion_type const*>(pv);
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}
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/// Converts a reference to the \c value_type to a reference to the \c conversion_type
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static conversion_type &convert_reference(value_type &v)
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{
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return dynamic_cast<conversion_type&>(v);
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}
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/// Converts a reference-to-const to the \c value_type to a reference-to-const to the \c conversion_type
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static conversion_type const& convert_const_reference(value_type const& v)
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{
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return dynamic_cast<conversion_type const&>(v);
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}
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/// Pointer conversion type
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struct pointer_conversion
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{
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conversion_type *operator ()(value_type *pv)
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{
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return convert_pointer(pv);
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}
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};
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/// Pointer-to-const conversion type
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struct pointer_const_conversion
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{
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conversion_type const* operator ()(value_type const* pv)
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{
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return convert_const_pointer(pv);
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}
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};
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/// Reference conversion type
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struct reference_conversion
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{
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conversion_type& operator ()(value_type &v)
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{
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return convert_reference(v);
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}
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};
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/// Reference-to-const conversion type
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struct reference_const_conversion
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{
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conversion_type const& operator ()(value_type const& v)
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{
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return convert_const_reference(v);
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}
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};
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};
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// class reinterpret_conversion
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/** \brief Implements conversion via C++'s <code>reinterpret_cast</code>
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*
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* \ingroup group__library__obsolete
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*
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* \param T The value type
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* \param C The conversion type
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*/
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template< ss_typename_param_k T
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, ss_typename_param_k C
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>
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struct reinterpret_conversion
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{
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public:
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/// The value type
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typedef T value_type;
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/// The conversion type
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typedef C conversion_type;
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public:
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/// Converts a pointer to the \c value_type to a pointer to the \c conversion_type
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static conversion_type *convert_pointer(value_type *pv)
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{
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return reinterpret_cast<conversion_type*>(pv);
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}
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/// Converts a pointer-to-const to the \c value_type to a pointer-to-const to the \c conversion_type
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static conversion_type const* convert_const_pointer(value_type const* pv)
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{
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return reinterpret_cast<conversion_type const*>(pv);
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}
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/// Converts a reference to the \c value_type to a reference to the \c conversion_type
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static conversion_type &convert_reference(value_type &v)
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{
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return reinterpret_cast<conversion_type&>(v);
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}
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/// Converts a reference-to-const to the \c value_type to a reference-to-const to the \c conversion_type
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static conversion_type const& convert_const_reference(value_type const& v)
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{
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return reinterpret_cast<conversion_type const&>(v);
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}
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/// Pointer conversion type
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struct pointer_conversion
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{
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conversion_type *operator ()(value_type *pv)
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{
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return convert_pointer(pv);
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}
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};
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/// Pointer-to-const conversion type
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struct pointer_const_conversion
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{
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conversion_type const* operator ()(value_type const* pv)
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{
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return convert_const_pointer(pv);
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}
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};
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/// Reference conversion type
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struct reference_conversion
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{
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conversion_type& operator ()(value_type &v)
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{
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return convert_reference(v);
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}
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};
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/// Reference-to-const conversion type
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struct reference_const_conversion
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{
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conversion_type const& operator ()(value_type const& v)
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{
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return convert_const_reference(v);
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}
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};
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};
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// class c_conversion
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/** \brief Implements conversion via C-style casts
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*
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* \ingroup group__library__obsolete
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*
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* \param T The value type
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* \param C The conversion type
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*/
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template< ss_typename_param_k T
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, ss_typename_param_k C
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>
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struct c_conversion
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{
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public:
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/// The value type
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typedef T value_type;
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/// The conversion type
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typedef C conversion_type;
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public:
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/// Converts a pointer to the \c value_type to a pointer to the \c conversion_type
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static conversion_type *convert_pointer(value_type *pv)
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{
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return (conversion_type*)(pv);
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}
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/// Converts a pointer-to-const to the \c value_type to a pointer-to-const to the \c conversion_type
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static conversion_type const* convert_const_pointer(value_type const* pv)
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{
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return (conversion_type const*)(pv);
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}
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/// Converts a reference to the \c value_type to a reference to the \c conversion_type
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static conversion_type &convert_reference(value_type &v)
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{
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return (conversion_type&)(v);
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}
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/// Converts a reference-to-const to the \c value_type to a reference-to-const to the \c conversion_type
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static conversion_type const& convert_const_reference(value_type const& v)
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{
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return (conversion_type const&)(v);
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}
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/// Pointer conversion type
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struct pointer_conversion
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{
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conversion_type *operator ()(value_type *pv)
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{
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return convert_pointer(pv);
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}
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};
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/// Pointer-to-const conversion type
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struct pointer_const_conversion
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{
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conversion_type const* operator ()(value_type const* pv)
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{
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return convert_const_pointer(pv);
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}
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};
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/// Reference conversion type
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struct reference_conversion
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{
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conversion_type& operator ()(value_type &v)
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{
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return convert_reference(v);
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}
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};
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/// Reference-to-const conversion type
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struct reference_const_conversion
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{
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conversion_type const& operator ()(value_type const& v)
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{
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return convert_const_reference(v);
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}
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};
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};
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// class conversion_veneer
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/** \brief This class allows policy-based control of the four conversions: pointer, non-mutable pointer, reference, non-mutable reference
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*
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* \param T The type that will be subjected to the <a href = "http://synesis.com.au/resources/articles/cpp/veneers.pdf">veneer</a>
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* \param C The type that T will be converted to
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* \param V The value type. On translators that support default template arguments this defaults to T.
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* \param P The type that controls the pointer conversion
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* \param R The type that controls the reference conversion
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* \param PC The type that controls the pointer-to-const conversion
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* \param RC The type that controls the reference-to-const conversion
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*
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* \ingroup concepts_veneer
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*/
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template< ss_typename_param_k T
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, ss_typename_param_k C
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#ifdef STLSOFT_CF_TEMPLATE_CLASS_DEFAULT_FUNDAMENTAL_ARGUMENT_SUPPORT
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, ss_typename_param_k V = T
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, ss_typename_param_k P = invalid_conversion<T, C>
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, ss_typename_param_k R = invalid_conversion<T, C>
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, ss_typename_param_k PC = P
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, ss_typename_param_k RC = R
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#else
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, ss_typename_param_k V
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, ss_typename_param_k P
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, ss_typename_param_k R
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, ss_typename_param_k PC
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, ss_typename_param_k RC
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#endif /* STLSOFT_CF_TEMPLATE_CLASS_DEFAULT_FUNDAMENTAL_ARGUMENT_SUPPORT */
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>
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class conversion_veneer
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: public T
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{
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public:
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/// The parent class type
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typedef T parent_class_type;
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/// The conversion type
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typedef C conversion_type;
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/// The value type
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typedef V value_type;
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/// The pointer conversion type
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typedef ss_typename_type_k P::pointer_conversion pointer_conversion_type;
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/// The reference conversion type
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typedef ss_typename_type_k R::reference_conversion reference_conversion_type;
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/// The pointer-to-const conversion type
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typedef ss_typename_type_k PC::pointer_const_conversion pointer_const_conversion_type;
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/// The reference-to-const conversion type
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typedef ss_typename_type_k RC::reference_const_conversion reference_const_conversion_type;
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/// The current parameterisation of the type
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typedef conversion_veneer<T, C, V, P, R, PC, RC> class_type;
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// Construction
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public:
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/// The default constructor
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conversion_veneer()
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{
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stlsoft_constraint_must_be_same_size(T, class_type);
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}
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/// The copy constructor
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conversion_veneer(class_type const& rhs)
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: parent_class_type(rhs)
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{
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stlsoft_constraint_must_be_same_size(T, class_type);
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}
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/// Initialise from a value
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conversion_veneer(value_type const& rhs)
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: parent_class_type(rhs)
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{
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stlsoft_constraint_must_be_same_size(T, class_type);
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}
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|
#ifdef STLSOFT_CF_MEMBER_TEMPLATE_CTOR_SUPPORT
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|
// For compilers that support member templates, the following constructors
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|
// are provided.
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/// Single parameter constructor
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|
template <ss_typename_param_k N1>
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ss_explicit_k conversion_veneer(N1 &n1)
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: parent_class_type(n1)
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{}
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/// Single parameter constructor
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template <ss_typename_param_k N1>
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ss_explicit_k conversion_veneer(N1 *n1)
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: parent_class_type(n1)
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{}
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|
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/// Two parameter constructor
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template <ss_typename_param_k N1, ss_typename_param_k N2>
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conversion_veneer(N1 n1, N2 n2)
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: parent_class_type(n1, n2)
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|
{}
|
|
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/// Three parameter constructor
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|
template <ss_typename_param_k N1, ss_typename_param_k N2, ss_typename_param_k N3>
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conversion_veneer(N1 n1, N2 n2, N3 n3)
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: parent_class_type(n1, n2, n3)
|
|
{}
|
|
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|
/// Four parameter constructor
|
|
template <ss_typename_param_k N1, ss_typename_param_k N2, ss_typename_param_k N3, ss_typename_param_k N4>
|
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conversion_veneer(N1 n1, N2 n2, N3 n3, N4 n4)
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|
: parent_class_type(n1, n2, n3, n4)
|
|
{}
|
|
|
|
/// Five parameter constructor
|
|
template <ss_typename_param_k N1, ss_typename_param_k N2, ss_typename_param_k N3, ss_typename_param_k N4, ss_typename_param_k N5>
|
|
conversion_veneer(N1 n1, N2 n2, N3 n3, N4 n4, N5 n5)
|
|
: parent_class_type(n1, n2, n3, n4, n5)
|
|
{}
|
|
|
|
/// Six parameter constructor
|
|
template <ss_typename_param_k N1, ss_typename_param_k N2, ss_typename_param_k N3, ss_typename_param_k N4, ss_typename_param_k N5, ss_typename_param_k N6>
|
|
conversion_veneer(N1 n1, N2 n2, N3 n3, N4 n4, N5 n5, N6 n6)
|
|
: parent_class_type(n1, n2, n3, n4, n5, n6)
|
|
{}
|
|
|
|
/// Seven parameter constructor
|
|
template <ss_typename_param_k N1, ss_typename_param_k N2, ss_typename_param_k N3, ss_typename_param_k N4, ss_typename_param_k N5, ss_typename_param_k N6, ss_typename_param_k N7>
|
|
conversion_veneer(N1 n1, N2 n2, N3 n3, N4 n4, N5 n5, N6 n6, N7 n7)
|
|
: parent_class_type(n1, n2, n3, n4, n5, n6, n7)
|
|
{}
|
|
|
|
/// Eight parameter constructor
|
|
template <ss_typename_param_k N1, ss_typename_param_k N2, ss_typename_param_k N3, ss_typename_param_k N4, ss_typename_param_k N5, ss_typename_param_k N6, ss_typename_param_k N7, ss_typename_param_k N8>
|
|
conversion_veneer(N1 n1, N2 n2, N3 n3, N4 n4, N5 n5, N6 n6, N7 n7, N8 n8)
|
|
: parent_class_type(n1, n2, n3, n4, n5, n6, n7, n8)
|
|
{}
|
|
#endif // STLSOFT_CF_MEMBER_TEMPLATE_CTOR_SUPPORT
|
|
|
|
/// Copy assignment operator
|
|
class_type& operator =(class_type const& rhs)
|
|
{
|
|
static_cast<parent_class_type&>(*this) = rhs;
|
|
|
|
return *this;
|
|
}
|
|
|
|
/// Copy from a value
|
|
class_type& operator =(value_type const& rhs)
|
|
{
|
|
static_cast<parent_class_type&>(*this) = rhs;
|
|
|
|
return *this;
|
|
}
|
|
|
|
#ifdef STLSOFT_CF_MEMBER_TEMPLATE_FUNCTION_SUPPORT
|
|
/// Copy from a value
|
|
template <ss_typename_param_k T1>
|
|
class_type& operator =(T1 rhs)
|
|
{
|
|
static_cast<parent_class_type&>(*this) = rhs;
|
|
|
|
return *this;
|
|
}
|
|
#endif // STLSOFT_CF_MEMBER_TEMPLATE_FUNCTION_SUPPORT
|
|
|
|
// Note that the copy constructor is not defined, and will NOT be defined copy ctor/operator not made
|
|
|
|
// Conversions
|
|
public:
|
|
/// Implicit conversion to a reference to the conversion_type
|
|
operator conversion_type &()
|
|
{
|
|
return reference_conversion_type()(*this);
|
|
}
|
|
/// Implicit conversion to a reference-to-const to the conversion_type
|
|
operator conversion_type const& () const
|
|
{
|
|
return reference_const_conversion_type()(*this);
|
|
}
|
|
|
|
/// Address-of operator, returning a pointer to the conversion type
|
|
conversion_type * operator &()
|
|
{
|
|
// Take a local reference, such that the application of the address-of
|
|
// operator will allow user-defined conversions of the parent_class_type
|
|
// to be applied.
|
|
parent_class_type &_this = *this;
|
|
|
|
return pointer_conversion_type()(&_this);
|
|
}
|
|
/// Address-of operator, returning a pointer-to-const to the conversion type
|
|
conversion_type const* operator &() const
|
|
{
|
|
// Take a local reference, such that the application of the address-of
|
|
// operator will allow user-defined conversions of the parent_class_type
|
|
// to be applied.
|
|
parent_class_type const& _this = *this;
|
|
|
|
return pointer_const_conversion_type()(&_this);
|
|
}
|
|
};
|
|
|
|
/* ////////////////////////////////////////////////////////////////////// */
|
|
|
|
#ifndef _STLSOFT_NO_NAMESPACE
|
|
} // namespace stlsoft
|
|
#endif /* _STLSOFT_NO_NAMESPACE */
|
|
|
|
/* ////////////////////////////////////////////////////////////////////// */
|
|
|
|
#endif /* !STLSOFT_INCL_STLSOFT_OBSOLETE_HPP_CONVERSION_VENEER */
|
|
|
|
/* ///////////////////////////// end of file //////////////////////////// */
|