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83 lines
2.0 KiB
83 lines
2.0 KiB
// Boost.Bimap |
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// |
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// Copyright (c) 2006-2007 Matias Capeletto |
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// |
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// Distributed under the Boost Software License, Version 1.0. |
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// (See accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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/// \file relation/detail/mutant.hpp |
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/// \brief Mutate functions to extract views of mutant classes. |
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#ifndef BOOST_BIMAP_RELATION_DETAIL_MUTANT_HPP |
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#define BOOST_BIMAP_RELATION_DETAIL_MUTANT_HPP |
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#if defined(_MSC_VER) && (_MSC_VER>=1200) |
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#pragma once |
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#endif |
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#include <boost/config.hpp> |
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#include <boost/bimap/detail/debug/static_error.hpp> |
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#include <boost/mpl/contains.hpp> |
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#include <boost/mpl/assert.hpp> |
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#include <boost/utility.hpp> |
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#include <boost/static_assert.hpp> |
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#include <boost/type_traits/is_const.hpp> |
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#include <boost/mpl/not.hpp> |
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#include <boost/utility/enable_if.hpp> |
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namespace boost { |
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namespace bimaps { |
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namespace relation { |
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/// \brief Relation details, mutant idiom and symmetrical metafunctions builders. |
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namespace detail { |
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//@{ |
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/// \brief Converts a mutant class to a view with zero overhead. |
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/** |
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This function is a safe wrapper around reinterpret_cast. It checks at |
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compile time that the desired view is supported by the mutant class. |
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See also mutant, can_mutate_in. |
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\ingroup mutant_group |
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**/ |
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template< class View, class Type > |
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BOOST_DEDUCED_TYPENAME enable_if< mpl::not_< is_const< Type > >, |
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View& |
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>::type mutate( Type & m ) |
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{ |
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BOOST_MPL_ASSERT(( |
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::boost::mpl::contains<BOOST_DEDUCED_TYPENAME Type::mutant_views,View> |
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)); |
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return *reinterpret_cast< View* >(boost::addressof(m)); |
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} |
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template< class View, class Type > |
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BOOST_DEDUCED_TYPENAME enable_if< is_const< Type >, |
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const View& |
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>::type mutate( Type & m ) |
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{ |
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BOOST_MPL_ASSERT(( |
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::boost::mpl::contains<BOOST_DEDUCED_TYPENAME Type::mutant_views,View> |
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)); |
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return *reinterpret_cast< const View* >(boost::addressof(m)); |
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} |
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//@} |
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} // namespace detail |
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} // namespace relation |
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} // namespace bimaps |
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} // namespace boost |
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#endif // BOOST_BIMAP_RELATION_DETAIL_MUTANT_HPP |
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