ceph/src/boost/boost/proto/functional/range/empty.hpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 /// \file empty.hpp
   3 /// Proto callables for boost::empty()
   4 //
   5 //  Copyright 2012 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_RANGE_EMPTY_HPP_EAN_27_08_2012
  10 #define BOOST_PROTO_FUNCTIONAL_RANGE_EMPTY_HPP_EAN_27_08_2012
  11
  12 #include <boost/range/empty.hpp>
  13 #include <boost/proto/proto_fwd.hpp>
  14
  15 namespace boost { namespace proto { namespace functional
  16 {
  17
  18     // A PolymorphicFunctionObject that wraps boost::empty()
  19     struct empty
  20     {
  21         BOOST_PROTO_CALLABLE()
  22
  23         typedef bool result_type;
  24
  25         template<typename Rng>
  26         bool operator()(Rng const &rng) const
  27         {
  28             return boost::empty(rng);
  29         }
  30     };
  31
  32 }}}
  33
  34 #endif