ceph/src/boost/boost/multi_index/detail/modify_key_adaptor.hpp

   1 /* Copyright 2003-2013 Joaquin M Lopez Munoz.
   2  * Distributed under the Boost Software License, Version 1.0.
   3  * (See accompanying file LICENSE_1_0.txt or copy at
   4  * http://www.boost.org/LICENSE_1_0.txt)
   5  *
   6  * See http://www.boost.org/libs/multi_index for library home page.
   7  */
   8
   9 #ifndef BOOST_MULTI_INDEX_DETAIL_MODIFY_KEY_ADAPTOR_HPP
  10 #define BOOST_MULTI_INDEX_DETAIL_MODIFY_KEY_ADAPTOR_HPP
  11
  12 #if defined(_MSC_VER)
  13 #pragma once
  14 #endif
  15
  16 namespace boost{
  17
  18 namespace multi_index{
  19
  20 namespace detail{
  21
  22 /* Functional adaptor to resolve modify_key as a call to modify.
  23  * Preferred over compose_f_gx and stuff cause it eliminates problems
  24  * with references to references, dealing with function pointers, etc.
  25  */
  26
  27 template<typename Fun,typename Value,typename KeyFromValue>
  28 struct modify_key_adaptor
  29 {
  30
  31   modify_key_adaptor(Fun f_,KeyFromValue kfv_):f(f_),kfv(kfv_){}
  32
  33   void operator()(Value& x)
  34   {
  35     f(kfv(x));
  36   }
  37
  38 private:
  39   Fun          f;
  40   KeyFromValue kfv;
  41 };
  42
  43 } /* namespace multi_index::detail */
  44
  45 } /* namespace multi_index */
  46
  47 } /* namespace boost */
  48
  49 #endif