// 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 container_adaptor/detail/functor_bag.hpp
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/// \brief Defines a EBO optimizacion helper for functors.
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#ifndef BOOST_BIMAP_CONTAINER_ADAPTOR_DETAIL_FUNCTOR_BAG_HPP
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#define BOOST_BIMAP_CONTAINER_ADAPTOR_DETAIL_FUNCTOR_BAG_HPP
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#if defined(_MSC_VER)
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#pragma once
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#endif
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#include <boost/config.hpp>
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#if defined(BOOST_MSVC)
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// This bogus warning will appear when add_const is applied to a
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// const volatile reference because we can't detect const volatile
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// references with MSVC6.
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# pragma warning(push)
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# pragma warning(disable:4181)
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// warning C4181: qualifier applied to reference type ignored
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#endif
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#include <boost/mpl/placeholders.hpp>
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#include <boost/type_traits/add_reference.hpp>
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#include <boost/type_traits/is_base_of.hpp>
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#include <boost/mpl/inherit_linearly.hpp>
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#include <boost/mpl/inherit.hpp>
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namespace boost {
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namespace bimaps {
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namespace container_adaptor {
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namespace detail {
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/// \brief EBO optimizacion helper for functors
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/**
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This class is a generalization of a helper class explained in an article by
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Nathan C. Myers.\n
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See it at \link http://www.cantrip.org/emptyopt.html
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**/
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template < class Data, class FunctorList >
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struct data_with_functor_bag :
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public mpl::inherit_linearly<
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FunctorList,
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mpl::if_< is_base_of< mpl::_2, mpl::_1 >,
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// {
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mpl::_1,
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// }
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// else
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// {
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mpl::inherit< mpl::_1, mpl::_2 >
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// }
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>
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>::type
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{
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Data data;
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data_with_functor_bag() {}
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data_with_functor_bag(BOOST_DEDUCED_TYPENAME add_reference<Data>::type d)
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: data(d) {}
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template< class Functor >
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Functor& functor()
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{
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return *(static_cast<Functor*>(this));
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}
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template< class Functor >
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const Functor& functor() const
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{
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return *(static_cast<Functor const *>(this));
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}
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};
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} // namespace detail
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} // namespace container_adaptor
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} // namespace bimaps
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} // namespace boost
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#if defined(BOOST_MSVC)
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# pragma warning(pop)
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#endif
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#endif // BOOST_BIMAP_CONTAINER_ADAPTOR_DETAIL_FUNCTOR_BAG_HPP
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