| // Boost.Bimap |
| // |
| // Copyright (c) 2006-2007 Matias Capeletto |
| // |
| // Distributed under the Boost Software License, Version 1.0. |
| // (See accompanying file LICENSE_1_0.txt or copy at |
| // http://www.boost.org/LICENSE_1_0.txt) |
| |
| /// \file container_adaptor/detail/functor_bag.hpp |
| /// \brief Defines a EBO optimizacion helper for functors. |
| |
| #ifndef BOOST_BIMAP_CONTAINER_ADAPTOR_DETAIL_FUNCTOR_BAG_HPP |
| #define BOOST_BIMAP_CONTAINER_ADAPTOR_DETAIL_FUNCTOR_BAG_HPP |
| |
| #if defined(_MSC_VER) && (_MSC_VER>=1200) |
| #pragma once |
| #endif |
| |
| #include <boost/config.hpp> |
| |
| #if defined(BOOST_MSVC) |
| // This bogus warning will appear when add_const is applied to a |
| // const volatile reference because we can't detect const volatile |
| // references with MSVC6. |
| # pragma warning(push) |
| # pragma warning(disable:4181) |
| // warning C4181: qualifier applied to reference type ignored |
| #endif |
| |
| #include <boost/mpl/placeholders.hpp> |
| |
| #include <boost/type_traits/add_reference.hpp> |
| #include <boost/type_traits/is_base_of.hpp> |
| |
| #include <boost/mpl/inherit_linearly.hpp> |
| #include <boost/mpl/inherit.hpp> |
| |
| namespace boost { |
| namespace bimaps { |
| namespace container_adaptor { |
| namespace detail { |
| |
| /// \brief EBO optimizacion helper for functors |
| /** |
| |
| This class is a generalization of a helper class explained in an article by |
| Nathan C. Myers.\n |
| See it at \link http://www.cantrip.org/emptyopt.html |
| **/ |
| |
| template < class Data, class FunctorList > |
| struct data_with_functor_bag : |
| |
| public mpl::inherit_linearly< |
| |
| FunctorList, |
| mpl::if_< is_base_of< mpl::_2, mpl::_1 >, |
| // { |
| mpl::_1, |
| // } |
| // else |
| // { |
| mpl::inherit< mpl::_1, mpl::_2 > |
| // } |
| > |
| |
| >::type |
| { |
| Data data; |
| |
| data_with_functor_bag() {} |
| |
| data_with_functor_bag(BOOST_DEDUCED_TYPENAME add_reference<Data>::type d) |
| : data(d) {} |
| |
| template< class Functor > |
| Functor& functor() |
| { |
| return *(static_cast<Functor*>(this)); |
| } |
| |
| template< class Functor > |
| const Functor& functor() const |
| { |
| return *(static_cast<Functor const *>(this)); |
| } |
| }; |
| |
| } // namespace detail |
| } // namespace container_adaptor |
| } // namespace bimaps |
| } // namespace boost |
| |
| #if defined(BOOST_MSVC) |
| # pragma warning(pop) |
| #endif |
| |
| #endif // BOOST_BIMAP_CONTAINER_ADAPTOR_DETAIL_FUNCTOR_BAG_HPP |
| |
| |