1 /*=============================================================================
2     Copyright (c) 2012 Nathan Ridge
3 
4     Distributed under the Boost Software License, Version 1.0. (See accompanying
5     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6 ==============================================================================*/
7 #ifndef BOOST_FUSION_SUPPORT_AS_CONST_HPP
8 #define BOOST_FUSION_SUPPORT_AS_CONST_HPP
9 
10 #include <boost/config.hpp>
11 #include <boost/fusion/support/config.hpp>
12 
13 namespace boost { namespace fusion { namespace extension
14 {
15     // A customization point that allows certain wrappers around
16     // Fusion sequence elements (e.g. adt_attribute_proxy) to be
17     // unwrapped in contexts where the element only needs to be
18     // read. The library wraps accesses to Fusion elements in
19     // such contexts with calls to this function. Users can
20     // specialize this function for their own wrappers.
21     template <typename T>
22     BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
as_const(const T & obj)23     inline const T& as_const(const T& obj) BOOST_NOEXCEPT
24     {
25         return obj;
26     }
27 
28 }}}
29 
30 #endif
31