Added thirdparty: boost library

thirdparty/include/boost/multi_index/detail/index_access_sequence.hpp

@@ -0,0 +1,80 @@
+/* Copyright 2003-2021 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/multi_index for library home page.
+ */
+
+#ifndef BOOST_MULTI_INDEX_DETAIL_INDEX_ACCESS_SEQUENCE_HPP
+#define BOOST_MULTI_INDEX_DETAIL_INDEX_ACCESS_SEQUENCE_HPP
+
+#if defined(_MSC_VER)
+#pragma once
+#endif
+
+#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
+#include <boost/mpl/if.hpp>
+#include <boost/mpl/size.hpp>
+#include <boost/multi_index_container_fwd.hpp>
+
+namespace boost{
+
+namespace multi_index{
+
+namespace detail{
+
+/* Successive access to the indices of a multi_index_container. Used as dst in
+ * backbone function extract_(x,dst) to retrieve the destination indices
+ * where iterators referring to x must be transferred to (in merging
+ * operations).
+ */
+
+template<typename MultiIndexContainer,int N=0>
+struct index_access_sequence;
+
+struct index_access_sequence_terminal
+{
+  index_access_sequence_terminal(void*){}
+};
+
+template<typename MultiIndexContainer,int N>
+struct index_access_sequence_normal
+{
+  MultiIndexContainer* p;
+
+  index_access_sequence_normal(MultiIndexContainer* p_):p(p_){}
+
+  typename nth_index<MultiIndexContainer,N>::type&
+  get(){return p->template get<N>();}
+
+  index_access_sequence<MultiIndexContainer,N+1>
+  next(){return index_access_sequence<MultiIndexContainer,N+1>(p);}
+};
+
+template<typename MultiIndexContainer,int N>
+struct index_access_sequence_base:
+  mpl::if_c<
+    N<mpl::size<typename MultiIndexContainer::index_type_list>::type::value,
+    index_access_sequence_normal<MultiIndexContainer,N>,
+    index_access_sequence_terminal
+  >
+{};
+
+template<typename MultiIndexContainer,int N>
+struct index_access_sequence:
+  index_access_sequence_base<MultiIndexContainer,N>::type
+{
+  typedef typename index_access_sequence_base<
+    MultiIndexContainer,N>::type               super;
+ 
+  index_access_sequence(MultiIndexContainer* p):super(p){}
+};
+
+} /* namespace multi_index::detail */
+
+} /* namespace multi_index */
+
+} /* namespace boost */
+
+#endif