contrib/gcc-4.4/libstdc++-v3/include/ext/pb_ds/detail/tree_policy/node_metadata_selector.hpp

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005, 2006, 2009 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the terms
   7 // of the GNU General Public License as published by the Free Software
   8 // Foundation; either version 3, or (at your option) any later
   9 // version.
  10
  11 // This library is distributed in the hope that it will be useful, but
  12 // WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 // General Public License for more details.
  15
  16 // Under Section 7 of GPL version 3, you are granted additional
  17 // permissions described in the GCC Runtime Library Exception, version
  18 // 3.1, as published by the Free Software Foundation.
  19
  20 // You should have received a copy of the GNU General Public License and
  21 // a copy of the GCC Runtime Library Exception along with this program;
  22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 // <http://www.gnu.org/licenses/>.
  24
  25 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
  26
  27 // Permission to use, copy, modify, sell, and distribute this software
  28 // is hereby granted without fee, provided that the above copyright
  29 // notice appears in all copies, and that both that copyright notice
  30 // and this permission notice appear in supporting documentation. None
  31 // of the above authors, nor IBM Haifa Research Laboratories, make any
  32 // representation about the suitability of this software for any
  33 // purpose. It is provided "as is" without express or implied
  34 // warranty.
  35
  36 /**
  37  * @file node_metadata_selector.hpp
  38  * Contains an implementation class for trees.
  39  */
  40
  41 #ifndef PB_DS_TREE_NODE_METADATA_SELECTOR_HPP
  42 #define PB_DS_TREE_NODE_METADATA_SELECTOR_HPP
  43
  44 #include <ext/pb_ds/detail/basic_tree_policy/null_node_metadata.hpp>
  45 #include <ext/pb_ds/detail/types_traits.hpp>
  46
  47 namespace __gnu_pbds
  48 {
  49   namespace detail
  50   {
  51
  52     template<typename Node_Update, bool Null>
  53     struct tree_metadata_helper
  54     {
  55       typedef typename Node_Update::metadata_type type;
  56     };
  57
  58     template<typename Node_Update>
  59     struct tree_metadata_helper<
  60       Node_Update,
  61       true>
  62     {
  63       typedef null_node_metadata type;
  64     };
  65
  66     template<typename Key,
  67              typename Data,
  68              class Cmp_Fn,
  69              template<typename Const_Node_Iterator,
  70                       class Const_Iterator,
  71                       class Cmp_Fn_,
  72                       class Allocator_>
  73     class Node_Update,
  74              class Allocator>
  75     struct tree_node_metadata_selector
  76     {
  77     private:
  78       typedef
  79       dumconst_node_iterator<
  80       Key,
  81       Data,
  82       Allocator>
  83       dumconst_node_it;
  84
  85       enum
  86         {
  87           null_update =
  88           is_same<
  89           Node_Update<
  90           dumconst_node_it,
  91           dumconst_node_it,
  92           Cmp_Fn,
  93           Allocator>,
  94           null_tree_node_update<
  95           dumconst_node_it,
  96           dumconst_node_it,
  97           Cmp_Fn,
  98           Allocator> >::value
  99         };
 100
 101     public:
 102       typedef
 103       typename tree_metadata_helper<
 104       Node_Update<
 105       dumconst_node_it,
 106       dumconst_node_it,
 107       Cmp_Fn,
 108       Allocator>,
 109       null_update>::type
 110       type;
 111     };
 112
 113   } // namespace detail
 114 } // namespace __gnu_pbds
 115
 116 #endif // #ifndef PB_DS_TREE_NODE_METADATA_SELECTOR_HPP