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290 lines
8.1 KiB
290 lines
8.1 KiB
/* /////////////////////////////////////////////////////////////////////////
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* File: stlsoft/conversion/explicit_cast.hpp (originally MTExCast.h, ::SynesisStl)
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*
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* Purpose: Class to provide explicit cast operators.
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*
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* Created: 20th September 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/conversion/explicit_cast.hpp
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*
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* \brief [C++ only] Definition of the stlsoft::explicit_cast cast class
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* (\ref group__library__conversion "Conversion" Library).
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*/
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#ifndef STLSOFT_INCL_STLSOFT_CONVERSION_HPP_EXPLICIT_CAST
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#define STLSOFT_INCL_STLSOFT_CONVERSION_HPP_EXPLICIT_CAST
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#ifndef STLSOFT_DOCUMENTATION_SKIP_SECTION
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# define STLSOFT_VER_STLSOFT_CONVERSION_HPP_EXPLICIT_CAST_MAJOR 4
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# define STLSOFT_VER_STLSOFT_CONVERSION_HPP_EXPLICIT_CAST_MINOR 0
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# define STLSOFT_VER_STLSOFT_CONVERSION_HPP_EXPLICIT_CAST_REVISION 1
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# define STLSOFT_VER_STLSOFT_CONVERSION_HPP_EXPLICIT_CAST_EDIT 36
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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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// class explicit_cast
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/** \brief This class is used to provide explicit casting operators.
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*
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* \ingroup group__library__conversion
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*
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* \param T The underlying type of the cast
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*/
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template <ss_typename_param_k T>
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class explicit_cast
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{
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public:
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typedef T value_type;
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typedef explicit_cast<T> class_type;
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// Construction
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public:
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explicit_cast(T t)
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: m_t(t)
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{}
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#ifndef STLSOFT_CF_TEMPLATE_PARTIAL_SPECIALISATION_SUPPORT
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// For compilers that do not support partial specialisation we need to
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// enforce the constraint that only basic types may be used.
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~explicit_cast() stlsoft_throw_0()
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{
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union must_be_basic_type
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{
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int i;
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T t;
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};
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}
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#endif /* !STLSOFT_CF_TEMPLATE_PARTIAL_SPECIALISATION_SUPPORT */
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// Conversions
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public:
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operator value_type () const
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{
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return m_t;
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}
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// Members
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private:
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T m_t;
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};
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#ifdef STLSOFT_CF_TEMPLATE_PARTIAL_SPECIALISATION_SUPPORT
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/** \brief Being able to cast to non-const references does not work, since
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* the compilers will refuse to apply such to a temporary.
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*
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* \ingroup group__library__conversion
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*
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* Furthermore, it is too evil to contemplate (see Effective C++ #30)
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* so we simply hide the constructor and conversion operator.
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*/
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template <ss_typename_param_k T>
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class explicit_cast<T &>
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{
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public:
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typedef T value_type;
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typedef explicit_cast<T> class_type;
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// Construction
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private:
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explicit_cast(T &);
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// Conversions
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private:
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operator T & ();
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# if defined(STLSOFT_COMPILER_IS_GCC)
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public: static void f() {}
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# endif /* compiler */
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};
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# ifdef _STLSOFT_EXPLICIT_CAST_FORCE_ALLOW_REFERENCE_TO_CONST_UDT
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/* Compiler check */
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# if defined(STLSOFT_COMPILER_IS_BORLAND) || \
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defined(STLSOFT_COMPILER_IS_DMC) || \
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defined(STLSOFT_COMPILER_IS_GCC) || \
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( defined(STLSOFT_COMPILER_IS_MSVC) && \
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_MSC_VER == 1310) || \
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defined(STLSOFT_COMPILER_IS_WATCOM)
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// These compilers are ok
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# elif defined(STLSOFT_COMPILER_IS_INTEL) || \
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( defined(STLSOFT_COMPILER_IS_MSVC) && \
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_MSC_VER != 1310)
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// These are not
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# error The current compiler does not properly implement it
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# else /* ? compiler */
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// These are unknown
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# error The current compiler has not been assessed as to whether it correctly translates explicit_cast for references to non-const
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# endif /* compiler */
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template <ss_typename_param_k T>
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class explicit_cast<T const&>
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{
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public:
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typedef T value_type;
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typedef explicit_cast<T> class_type;
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// Construction
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public:
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explicit_cast(T const& t)
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: m_t(t)
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{}
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// Conversions
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public:
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operator T const& () const
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{
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return m_t;
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}
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// Members
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private:
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T const& m_t;
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};
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# else /* ? _STLSOFT_EXPLICIT_CAST_FORCE_ALLOW_REFERENCE_TO_CONST_UDT */
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# ifndef STLSOFT_DOCUMENTATION_SKIP_SECTION
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# if defined(STLSOFT_COMPILER_IS_MSVC)
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# if _MSC_VER >= 1200
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# pragma warning(push)
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# endif /* _MSC_VER >= 1200 */
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# pragma warning(disable : 4512)
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# endif /* compiler */
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# ifndef STLSOFT_INCL_STLSOFT_INTERNAL_HPP_EXPLICIT_CAST_SPECIALISATIONS
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# include <stlsoft/conversion/internal/explicit_cast_specialisations.hpp>
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# endif /* !STLSOFT_INCL_STLSOFT_INTERNAL_HPP_EXPLICIT_CAST_SPECIALISATIONS */
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# if defined(STLSOFT_COMPILER_IS_MSVC)
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# if _MSC_VER >= 1200
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# pragma warning(pop)
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# else /* _MSC_VER */
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# pragma warning(disable : 4512)
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# endif /* _MSC_VER >= 1200 */
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# endif /* compiler */
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# endif /* !STLSOFT_DOCUMENTATION_SKIP_SECTION */
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# endif /* _STLSOFT_EXPLICIT_CAST_FORCE_ALLOW_REFERENCE_TO_CONST_UDT */
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/** \brief Not sure I really like this one, and reserve the right to remove it
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* but for now it stays.
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*
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* \ingroup group__library__conversion
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*/
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template <ss_typename_param_k T>
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class explicit_cast<T *>
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{
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public:
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typedef T value_type;
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typedef explicit_cast<T> class_type;
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// Construction
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public:
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explicit_cast(T *t)
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: m_t(t)
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{}
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// Conversions
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public:
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operator T * ()
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{
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return m_t;
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}
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// Members
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private:
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T *m_t;
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};
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# ifndef STLSOFT_DOCUMENTATION_SKIP_SECTION
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template <ss_typename_param_k T>
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class explicit_cast<T const*>
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{
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public:
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typedef T value_type;
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typedef explicit_cast<T> class_type;
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// Construction
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public:
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explicit_cast(T const* t)
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: m_t(t)
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{}
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// Conversions
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public:
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operator T const* () const
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{
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return m_t;
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}
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// Members
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private:
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T const* m_t;
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};
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# endif /* !STLSOFT_DOCUMENTATION_SKIP_SECTION */
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#endif // STLSOFT_CF_TEMPLATE_PARTIAL_SPECIALISATION_SUPPORT
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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_CONVERSION_HPP_EXPLICIT_CAST */
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/* ///////////////////////////// end of file //////////////////////////// */
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