ceph/src/boost/boost/flyweight/static_holder.hpp

   1 /* Copyright 2006-2009 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/flyweight for library home page.
   7  */
   8
   9 #ifndef BOOST_FLYWEIGHT_STATIC_HOLDER_HPP
  10 #define BOOST_FLYWEIGHT_STATIC_HOLDER_HPP
  11
  12 #if defined(_MSC_VER)
  13 #pragma once
  14 #endif
  15
  16 #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
  17 #include <boost/flyweight/static_holder_fwd.hpp>
  18 #include <boost/flyweight/holder_tag.hpp>
  19 #include <boost/mpl/aux_/lambda_support.hpp>
  20
  21 /* Simplest holder storing the T object as a local static variable.
  22  */
  23
  24 namespace boost{
  25
  26 namespace flyweights{
  27
  28 template<typename C>
  29 struct static_holder_class:holder_marker
  30 {
  31   static C& get()
  32   {
  33     static C c;
  34     return c;
  35   }
  36
  37   typedef static_holder_class type;
  38   BOOST_MPL_AUX_LAMBDA_SUPPORT(1,static_holder_class,(C))
  39 };
  40
  41 /* static_holder_class specifier */
  42
  43 struct static_holder:holder_marker
  44 {
  45   template<typename C>
  46   struct apply
  47   {
  48     typedef static_holder_class<C> type;
  49   };
  50 };
  51
  52 } /* namespace flyweights */
  53
  54 } /* namespace boost */
  55
  56 #endif