contrib/gcc-8.0/libstdc++-v3/include/ext/pb_ds/detail/tree_policy/node_metadata_selector.hpp

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005-2018 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 tree_policy/node_metadata_selector.hpp
  38  * Contains an implementation class for trees.
  39  */
  40
  41 #ifndef PB_DS_TREE_NODE_METADATA_DISPATCH_HPP
  42 #define PB_DS_TREE_NODE_METADATA_DISPATCH_HPP
  43
  44 #include <ext/pb_ds/detail/branch_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      *  @addtogroup traits Traits
  53      *  @{
  54      */
  55
  56     /// Tree metadata helper.
  57     template<typename Node_Update, bool _BTp>
  58       struct tree_metadata_helper;
  59
  60     /// Specialization, false.
  61     template<typename Node_Update>
  62       struct tree_metadata_helper<Node_Update, false>
  63       {
  64         typedef typename Node_Update::metadata_type     type;
  65       };
  66
  67     /// Specialization, true.
  68     template<typename Node_Update>
  69       struct tree_metadata_helper<Node_Update, true>
  70       {
  71         typedef null_type                               type;
  72       };
  73
  74     /// Tree node metadata dispatch.
  75     template<typename Key,
  76              typename Data,
  77              typename Cmp_Fn,
  78              template<typename Node_CItr,
  79                       typename Const_Iterator,
  80                       typename Cmp_Fn_,
  81                       typename _Alloc_>
  82              class Node_Update,
  83              typename _Alloc>
  84     struct tree_node_metadata_dispatch
  85     {
  86     private:
  87       typedef dumnode_const_iterator<Key, Data, _Alloc>         __it_type;
  88       typedef Node_Update<__it_type, __it_type, Cmp_Fn, _Alloc> __node_u;
  89       typedef null_node_update<__it_type, __it_type, Cmp_Fn, _Alloc> __nnode_u;
  90
  91       enum
  92         {
  93           null_update = is_same<__node_u, __nnode_u>::value
  94         };
  95
  96     public:
  97       typedef typename tree_metadata_helper<__node_u, null_update>::type type;
  98     };
  99     //@}
 100   } // namespace detail
 101 } // namespace __gnu_pbds
 102
 103 #endif // #ifndef PB_DS_TREE_NODE_METADATA_DISPATCH_HPP