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 {
getboost::flyweights::static_holder_class31   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
57