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105 lines
3.0 KiB
105 lines
3.0 KiB
/* Copyright 2003-2008 Joaquin M Lopez Munoz. |
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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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* |
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* See http://www.boost.org/libs/multi_index for library home page. |
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*/ |
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#ifndef BOOST_MULTI_INDEX_DETAIL_HASH_INDEX_ARGS_HPP |
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#define BOOST_MULTI_INDEX_DETAIL_HASH_INDEX_ARGS_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> /* keep it first to prevent nasty warns in MSVC */ |
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#include <boost/functional/hash.hpp> |
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#include <boost/mpl/aux_/na.hpp> |
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#include <boost/mpl/eval_if.hpp> |
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#include <boost/mpl/identity.hpp> |
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#include <boost/mpl/if.hpp> |
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#include <boost/multi_index/tag.hpp> |
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#include <boost/static_assert.hpp> |
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#include <boost/type_traits/is_same.hpp> |
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#include <functional> |
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namespace boost{ |
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namespace multi_index{ |
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namespace detail{ |
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/* Hashed index specifiers can be instantiated in two forms: |
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* |
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* (hashed_unique|hashed_non_unique)< |
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* KeyFromValue, |
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* Hash=boost::hash<KeyFromValue::result_type>, |
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* Pred=std::equal_to<KeyFromValue::result_type> > |
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* (hashed_unique|hashed_non_unique)< |
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* TagList, |
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* KeyFromValue, |
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* Hash=boost::hash<KeyFromValue::result_type>, |
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* Pred=std::equal_to<KeyFromValue::result_type> > |
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* |
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* hashed_index_args implements the machinery to accept this |
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* argument-dependent polymorphism. |
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*/ |
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template<typename KeyFromValue> |
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struct index_args_default_hash |
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{ |
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typedef ::boost::hash<typename KeyFromValue::result_type> type; |
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}; |
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template<typename KeyFromValue> |
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struct index_args_default_pred |
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{ |
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typedef std::equal_to<typename KeyFromValue::result_type> type; |
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}; |
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template<typename Arg1,typename Arg2,typename Arg3,typename Arg4> |
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struct hashed_index_args |
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{ |
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typedef is_tag<Arg1> full_form; |
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typedef typename mpl::if_< |
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full_form, |
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Arg1, |
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tag< > >::type tag_list_type; |
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typedef typename mpl::if_< |
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full_form, |
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Arg2, |
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Arg1>::type key_from_value_type; |
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typedef typename mpl::if_< |
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full_form, |
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Arg3, |
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Arg2>::type supplied_hash_type; |
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typedef typename mpl::eval_if< |
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mpl::is_na<supplied_hash_type>, |
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index_args_default_hash<key_from_value_type>, |
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mpl::identity<supplied_hash_type> |
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>::type hash_type; |
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typedef typename mpl::if_< |
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full_form, |
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Arg4, |
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Arg3>::type supplied_pred_type; |
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typedef typename mpl::eval_if< |
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mpl::is_na<supplied_pred_type>, |
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index_args_default_pred<key_from_value_type>, |
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mpl::identity<supplied_pred_type> |
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>::type pred_type; |
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BOOST_STATIC_ASSERT(is_tag<tag_list_type>::value); |
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BOOST_STATIC_ASSERT(!mpl::is_na<key_from_value_type>::value); |
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BOOST_STATIC_ASSERT(!mpl::is_na<hash_type>::value); |
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BOOST_STATIC_ASSERT(!mpl::is_na<pred_type>::value); |
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}; |
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} /* namespace multi_index::detail */ |
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} /* namespace multi_index */ |
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} /* namespace boost */ |
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#endif
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