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authorDongHun Kwak <dh0128.kwak@samsung.com>2017-09-13 11:24:46 +0900
committerDongHun Kwak <dh0128.kwak@samsung.com>2017-09-13 11:25:39 +0900
commit4fadd968fa12130524c8380f33fcfe25d4de79e5 (patch)
treefd26a490cd15388d42fc6652b3c5c13012e7f93e /boost/poly_collection/detail/iterator_traits.hpp
parentb5c87084afaef42b2d058f68091be31988a6a874 (diff)
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Imported Upstream version 1.65.0upstream/1.65.0
Change-Id: Icf8400b375482cb11bcf77440a6934ba360d6ba4 Signed-off-by: DongHun Kwak <dh0128.kwak@samsung.com>
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+/* Copyright 2016-2017 Joaquin M Lopez Munoz.
+ * 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)
+ *
+ * See http://www.boost.org/libs/poly_collection for library home page.
+ */
+
+#ifndef BOOST_POLY_COLLECTION_DETAIL_ITERATOR_TRAITS_HPP
+#define BOOST_POLY_COLLECTION_DETAIL_ITERATOR_TRAITS_HPP
+
+#if defined(_MSC_VER)
+#pragma once
+#endif
+
+#include <iterator>
+#include <type_traits>
+
+namespace boost{
+
+namespace poly_collection{
+
+namespace detail{
+
+/* (Internal) bunch of traits-grouped functions for const-preserving
+ * interoperatibility between iterators and local iterators of a
+ * poly_collection.
+ */
+
+template<typename Iterator>
+struct poly_collection_of /* to be specialized for iterator impls */
+{
+ using type=void;
+};
+
+namespace poly_collection_impl{
+
+template<typename Model,typename Allocator>
+class poly_collection;
+
+}
+
+template<typename PolyCollection>
+struct model_of;
+
+template<typename Model,typename Allocator>
+struct model_of<poly_collection_impl::poly_collection<Model,Allocator>>
+{
+ using type=Model;
+};
+
+template<typename Iterator>
+struct iterator_traits
+{
+ using container_type=typename poly_collection_of<Iterator>::type;
+ using is_const_iterator=typename std::is_const<
+ typename std::remove_reference<
+ typename std::iterator_traits<Iterator>::reference
+ >::type
+ >::type;
+ using iterator=typename std::conditional<
+ is_const_iterator::value,
+ typename container_type::const_iterator,
+ typename container_type::iterator
+ >::type;
+ using base_segment_info_iterator=typename std::conditional<
+ is_const_iterator::value,
+ typename container_type::const_base_segment_info_iterator,
+ typename container_type::base_segment_info_iterator
+ >::type;
+ using local_base_iterator=typename std::conditional<
+ is_const_iterator::value,
+ typename container_type::const_local_base_iterator,
+ typename container_type::local_base_iterator
+ >::type;
+ template<typename T>
+ using local_iterator=typename std::conditional<
+ is_const_iterator::value,
+ typename container_type::template const_local_iterator<T>,
+ typename container_type::template local_iterator<T>
+ >::type;
+
+ static base_segment_info_iterator
+ base_segment_info_iterator_from(iterator it)noexcept{return it.mapit;}
+
+ static base_segment_info_iterator
+ base_segment_info_iterator_from(local_base_iterator it)noexcept
+ {return it.mapit;}
+
+ static base_segment_info_iterator
+ end_base_segment_info_iterator_from(iterator it)noexcept{return it.mapend;}
+
+ static local_base_iterator
+ local_base_iterator_from(iterator it)noexcept
+ {
+ return {
+ it.mapit,
+ model_of<container_type>::type::nonconst_iterator(it.segpos)
+ };
+ }
+
+ static iterator
+ iterator_from(
+ local_base_iterator lbit,base_segment_info_iterator mapend)noexcept
+ {
+ return {lbit.mapit,mapend.base(),lbit.base()};
+ }
+};
+
+} /* namespace poly_collection::detail */
+
+} /* namespace poly_collection */
+
+} /* namespace boost */
+
+#endif