| 1 | // Boost.Bimap |
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| 2 | // |
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| 3 | // Copyright (c) 2006-2007 Matias Capeletto |
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| 4 | // |
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| 5 | // Distributed under the Boost Software License, Version 1.0. |
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| 6 | // (See accompanying file LICENSE_1_0.txt or copy at |
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| 7 | // http://www.boost.org/LICENSE_1_0.txt) |
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| 8 | |
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| 9 | /// \file container_adaptor/detail/functor_bag.hpp |
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| 10 | /// \brief Defines a EBO optimizacion helper for functors. |
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| 11 | |
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| 12 | #ifndef BOOST_BIMAP_CONTAINER_ADAPTOR_DETAIL_FUNCTOR_BAG_HPP |
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| 13 | #define BOOST_BIMAP_CONTAINER_ADAPTOR_DETAIL_FUNCTOR_BAG_HPP |
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| 14 | |
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| 15 | #if defined(_MSC_VER) |
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| 16 | #pragma once |
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| 17 | #endif |
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| 18 | |
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| 19 | #include <boost/config.hpp> |
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| 20 | |
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| 21 | #if defined(BOOST_MSVC) |
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| 22 | // This bogus warning will appear when add_const is applied to a |
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| 23 | // const volatile reference because we can't detect const volatile |
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| 24 | // references with MSVC6. |
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| 25 | # pragma warning(push) |
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| 26 | # pragma warning(disable:4181) |
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| 27 | // warning C4181: qualifier applied to reference type ignored |
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| 28 | #endif |
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| 29 | |
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| 30 | #include <boost/mpl/placeholders.hpp> |
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| 31 | |
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| 32 | #include <boost/type_traits/add_reference.hpp> |
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| 33 | #include <boost/type_traits/is_base_of.hpp> |
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| 34 | |
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| 35 | #include <boost/mpl/inherit_linearly.hpp> |
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| 36 | #include <boost/mpl/inherit.hpp> |
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| 37 | |
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| 38 | namespace boost { |
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| 39 | namespace bimaps { |
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| 40 | namespace container_adaptor { |
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| 41 | namespace detail { |
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| 42 | |
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| 43 | /// \brief EBO optimizacion helper for functors |
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| 44 | /** |
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| 45 | |
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| 46 | This class is a generalization of a helper class explained in an article by |
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| 47 | Nathan C. Myers.\n |
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| 48 | See it at \link http://www.cantrip.org/emptyopt.html |
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| 49 | **/ |
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| 50 | |
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| 51 | template < class Data, class FunctorList > |
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| 52 | struct data_with_functor_bag : |
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| 53 | |
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| 54 | public mpl::inherit_linearly< |
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| 55 | |
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| 56 | FunctorList, |
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| 57 | mpl::if_< is_base_of< mpl::_2, mpl::_1 >, |
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| 58 | // { |
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| 59 | mpl::_1, |
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| 60 | // } |
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| 61 | // else |
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| 62 | // { |
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| 63 | mpl::inherit< mpl::_1, mpl::_2 > |
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| 64 | // } |
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| 65 | > |
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| 66 | |
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| 67 | >::type |
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| 68 | { |
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| 69 | Data data; |
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| 70 | |
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| 71 | data_with_functor_bag() {} |
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| 72 | |
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| 73 | data_with_functor_bag(BOOST_DEDUCED_TYPENAME add_reference<Data>::type d) |
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| 74 | : data(d) {} |
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| 75 | |
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| 76 | template< class Functor > |
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| 77 | Functor& functor() |
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| 78 | { |
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| 79 | return *(static_cast<Functor*>(this)); |
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| 80 | } |
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| 81 | |
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| 82 | template< class Functor > |
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| 83 | const Functor& functor() const |
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| 84 | { |
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| 85 | return *(static_cast<Functor const *>(this)); |
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| 86 | } |
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| 87 | }; |
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| 88 | |
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| 89 | } // namespace detail |
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| 90 | } // namespace container_adaptor |
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| 91 | } // namespace bimaps |
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| 92 | } // namespace boost |
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| 93 | |
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| 94 | #if defined(BOOST_MSVC) |
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| 95 | # pragma warning(pop) |
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| 96 | #endif |
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| 97 | |
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| 98 | #endif // BOOST_BIMAP_CONTAINER_ADAPTOR_DETAIL_FUNCTOR_BAG_HPP |
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| 99 | |
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| 100 | |
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| 101 | |
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