Boost_1_39_0/boost/python/detail/value_arg.hpp

   1 // Copyright David Abrahams 2004. Distributed under the Boost
   2 // Software License, Version 1.0. (See accompanying
   3 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   4 #ifndef VALUE_ARG_DWA2004312_HPP
   5 # define VALUE_ARG_DWA2004312_HPP
   6
   7 # include <boost/python/detail/copy_ctor_mutates_rhs.hpp>
   8 # include <boost/mpl/if.hpp>
   9 # include <boost/type_traits/add_reference.hpp>
  10 # include <boost/type_traits/add_const.hpp>
  11
  12 namespace boost { namespace python { namespace detail {
  13
  14 template <class T>
  15 struct value_arg
  16   : mpl::if_<
  17         copy_ctor_mutates_rhs<T>
  18       , T
  19       , typename add_reference<
  20             typename add_const<T>::type
  21         >::type
  22   >
  23 {};
  24
  25 }}} // namespace boost::python::detail
  26
  27 #endif // VALUE_ARG_DWA2004312_HPP