ceph/src/boost/libs/compute/include/boost/compute/type_traits/result_of.hpp

   1 //---------------------------------------------------------------------------//
   2 // Copyright (c) 2013-2014 Kyle Lutz <kyle.r.lutz@gmail.com>
   3 //
   4 // Distributed under the Boost Software License, Version 1.0
   5 // See accompanying file LICENSE_1_0.txt or copy at
   6 // http://www.boost.org/LICENSE_1_0.txt
   7 //
   8 // See http://boostorg.github.com/compute for more information.
   9 //---------------------------------------------------------------------------//
  10
  11 #ifndef BOOST_COMPUTE_TYPE_TRAITS_RESULT_OF_HPP
  12 #define BOOST_COMPUTE_TYPE_TRAITS_RESULT_OF_HPP
  13
  14 #include <boost/utility/result_of.hpp>
  15
  16 namespace boost {
  17 namespace compute {
  18
  19 /// Returns the result of \c Function when called with \c Args.
  20 ///
  21 /// For example,
  22 /// \code
  23 /// // int + int = int
  24 /// result_of<plus(int, int)>::type == int
  25 /// \endcode
  26 template<class Signature>
  27 struct result_of
  28 {
  29     // the default implementation uses the TR1-style result_of protocol. note
  30     // that we explicitly do *not* use the C++11 decltype operator as we want
  31     // the result type as it would be on an OpenCL device, not the actual C++
  32     // type resulting from "invoking" the function on the host.
  33     typedef typename ::boost::tr1_result_of<Signature>::type type;
  34 };
  35
  36 } // end compute namespace
  37 } // end boost namespace
  38
  39 #endif // BOOST_COMPUTE_TYPE_TRAITS_RESULT_OF_HPP