Initial Commit

2018-02-08 21:28:33 -05:00
commit 678c1d3966
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+/* Copyright 2003-2013 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_NO_DUPLICATE_TAGS_HPP
+#define BOOST_MULTI_INDEX_DETAIL_NO_DUPLICATE_TAGS_HPP
+
+#if defined(_MSC_VER)
+#pragma once
+#endif
+
+#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
+#include <boost/mpl/fold.hpp>
+#include <boost/mpl/set/set0.hpp>
+
+namespace boost{
+
+namespace multi_index{
+
+namespace detail{
+
+/* no_duplicate_tags check at compile-time that a tag list
+ * has no duplicate tags.
+ * The algorithm deserves some explanation: tags
+ * are sequentially inserted into a mpl::set if they were
+ * not already present. Due to the magic of mpl::set
+ * (mpl::has_key is contant time), this operation takes linear
+ * time, and even MSVC++ 6.5 handles it gracefully (other obvious
+ * solutions are quadratic.)
+ */
+
+struct duplicate_tag_mark{};
+
+struct duplicate_tag_marker
+{
+  template <typename MplSet,typename Tag>
+  struct apply
+  {
+    typedef mpl::s_item<
+      typename mpl::if_<mpl::has_key<MplSet,Tag>,duplicate_tag_mark,Tag>::type,
+      MplSet
+    > type;
+  };
+};
+
+template<typename TagList>
+struct no_duplicate_tags
+{
+  typedef typename mpl::fold<
+    TagList,
+    mpl::set0<>,
+    duplicate_tag_marker
+  >::type aux;
+ 
+  BOOST_STATIC_CONSTANT(
+    bool,value=!(mpl::has_key<aux,duplicate_tag_mark>::value));
+};
+
+/* Variant for an index list: duplication is checked
+ * across all the indices.
+ */
+
+struct duplicate_tag_list_marker
+{
+  template <typename MplSet,typename Index>
+  struct apply:mpl::fold<
+    BOOST_DEDUCED_TYPENAME Index::tag_list,
+    MplSet,
+    duplicate_tag_marker>
+  {
+  };
+};
+
+template<typename IndexList>
+struct no_duplicate_tags_in_index_list
+{
+  typedef typename mpl::fold<
+    IndexList,
+    mpl::set0<>,
+    duplicate_tag_list_marker
+  >::type aux;
+ 
+  BOOST_STATIC_CONSTANT(
+    bool,value=!(mpl::has_key<aux,duplicate_tag_mark>::value));
+};
+
+} /* namespace multi_index::detail */
+
+} /* namespace multi_index */
+
+} /* namespace boost */
+
+#endif