ceph/src/boost/boost/proto/functional/fusion/push_front.hpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 /// \file push_front.hpp
   3 /// Proto callables Fusion push_front
   4 //
   5 //  Copyright 2010 Eric Niebler. Distributed under the Boost
   6 //  Software License, Version 1.0. (See accompanying file
   7 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   8
   9 #ifndef BOOST_PROTO_FUNCTIONAL_FUSION_PUSH_FRONT_HPP_EAN_11_27_2010
  10 #define BOOST_PROTO_FUNCTIONAL_FUSION_PUSH_FRONT_HPP_EAN_11_27_2010
  11
  12 #include <boost/type_traits/add_const.hpp>
  13 #include <boost/type_traits/remove_const.hpp>
  14 #include <boost/type_traits/remove_reference.hpp>
  15 #include <boost/fusion/include/push_front.hpp>
  16 #include <boost/proto/proto_fwd.hpp>
  17
  18 namespace boost { namespace proto { namespace functional
  19 {
  20     /// \brief A PolymorphicFunctionObject type that invokes the
  21     /// \c fusion::push_front() algorithm on its argument.
  22     ///
  23     /// A PolymorphicFunctionObject type that invokes the
  24     /// \c fusion::push_front() algorithm on its argument.
  25     struct push_front
  26     {
  27         BOOST_PROTO_CALLABLE()
  28
  29         template<typename Sig>
  30         struct result;
  31
  32         template<typename This, typename Seq, typename T>
  33         struct result<This(Seq, T)>
  34           : fusion::result_of::push_front<
  35                 typename boost::add_const<typename boost::remove_reference<Seq>::type>::type
  36               , typename boost::remove_const<typename boost::remove_reference<T>::type>::type
  37             >
  38         {};
  39
  40         template<typename Seq, typename T>
  41         typename fusion::result_of::push_front<Seq const, T>::type
  42         operator ()(Seq const &seq, T const &t) const
  43         {
  44             return fusion::push_front(seq, t);
  45         }
  46     };
  47 }}}
  48
  49 #endif