ceph/src/boost/boost/fusion/support/as_const.hpp

   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
  23     inline const T& as_const(const T& obj) BOOST_NOEXCEPT
  24     {
  25         return obj;
  26     }
  27
  28 }}}
  29
  30 #endif