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  1. // -*- C++ -*-
  2.  
  3. // Copyright (C) 2005-2013 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 trie_policy/node_metadata_selector.hpp
  38.  * Contains an implementation class for tries.
  39.  */
  40.  
  41. #ifndef PB_DS_TRIE_NODE_METADATA_DISPATCH_HPP
  42. #define PB_DS_TRIE_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.     /// Trie metadata helper.
  57.     template<typename Node_Update, bool _BTp>
  58.       struct trie_metadata_helper;
  59.  
  60.     /// Specialization, false.
  61.     template<typename Node_Update>
  62.       struct trie_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 trie_metadata_helper<Node_Update, true>
  70.       {
  71.         typedef null_type                               type;
  72.       };
  73.  
  74.     /// Trie 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 trie_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 trie_metadata_helper<__node_u, null_update>::type type;
  98.     };
  99.     //@}
  100.   } // namespace detail
  101. } // namespace __gnu_pbds
  102.  
  103. #endif // #ifndef PB_DS_TRIE_NODE_METADATA_DISPATCH_HPP
  104.