84 lines
2.4 KiB
Plaintext
84 lines
2.4 KiB
Plaintext
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/* Copyright 2003-2013 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_ORD_INDEX_ARGS_HPP
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#define BOOST_MULTI_INDEX_DETAIL_ORD_INDEX_ARGS_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> /* keep it first to prevent nasty warns in MSVC */
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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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/* Oredered index specifiers can be instantiated in two forms:
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*
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* (ordered_unique|ordered_non_unique)<
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* KeyFromValue,Compare=std::less<KeyFromValue::result_type> >
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* (ordered_unique|ordered_non_unique)<
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* TagList,KeyFromValue,Compare=std::less<KeyFromValue::result_type> >
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*
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* index_args implements the machinery to accept this argument-dependent
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* polymorphism.
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*/
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template<typename KeyFromValue>
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struct index_args_default_compare
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{
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typedef std::less<typename KeyFromValue::result_type> type;
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};
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template<typename Arg1,typename Arg2,typename Arg3>
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struct ordered_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_compare_type;
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typedef typename mpl::eval_if<
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mpl::is_na<supplied_compare_type>,
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index_args_default_compare<key_from_value_type>,
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mpl::identity<supplied_compare_type>
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>::type compare_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<compare_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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