text: //  Copyright (c) 2013 Hartmut Kaiser
  //
  //  Distributed under the Boost Software License, Version 1.0. (See accompanying
  //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  
  #ifndef HPX_CONFIG_CONSTEXPR_HPP
  #define HPX_CONFIG_CONSTEXPR_HPP
  
  #if !defined(BOOST_CONSTEXPR)
  #define BOOST_CONSTEXPR
  #endif
  #if !defined(BOOST_CONSTEXPR_OR_CONST)
  #define BOOST_CONSTEXPR_OR_CONST const
  #endif
  
  #endif
  