ceph/src/boost/boost/compute/utility/dim.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_UTILITY_DIM_HPP
  12 #define BOOST_COMPUTE_UTILITY_DIM_HPP
  13
  14 #include <boost/compute/config.hpp>
  15 #include <boost/compute/utility/extents.hpp>
  16
  17 namespace boost {
  18 namespace compute {
  19
  20 #ifndef BOOST_COMPUTE_NO_VARIADIC_TEMPLATES
  21 /// The variadic \c dim() function provides a concise syntax for creating
  22 /// \ref extents objects.
  23 ///
  24 /// For example,
  25 /// \code
  26 /// extents<2> region = dim(640, 480); // region == (640, 480)
  27 /// \endcode
  28 ///
  29 /// \see \ref extents "extents<N>"
  30 template<class... Args>
  31 inline extents<sizeof...(Args)> dim(Args... args)
  32 {
  33     return extents<sizeof...(Args)>({ static_cast<size_t>(args)... });
  34 }
  35
  36 #if BOOST_WORKAROUND(BOOST_MSVC, <= 1800)
  37 // for some inexplicable reason passing one parameter to 'dim' variadic template
  38 // generates compile error on msvc 2013 update 4
  39 template<class T>
  40 inline extents<1> dim(T arg)
  41 {
  42     return extents<1>(static_cast<size_t>(arg));
  43 }
  44 #endif // BOOST_WORKAROUND(BOOST_MSVC, <= 1800)
  45
  46 #else
  47 // dim() function definitions for non-c++11 compilers
  48 #define BOOST_COMPUTE_DETAIL_ASSIGN_DIM(z, n, var) \
  49     var[n] = BOOST_PP_CAT(e, n);
  50
  51 #define BOOST_COMPUTE_DETAIL_DEFINE_DIM(z, n, var) \
  52     inline extents<n> dim(BOOST_PP_ENUM_PARAMS(n, size_t e)) \
  53     { \
  54         extents<n> exts; \
  55         BOOST_PP_REPEAT(n, BOOST_COMPUTE_DETAIL_ASSIGN_DIM, exts) \
  56         return exts; \
  57     }
  58
  59 BOOST_PP_REPEAT(BOOST_COMPUTE_MAX_ARITY, BOOST_COMPUTE_DETAIL_DEFINE_DIM, ~)
  60
  61 #undef BOOST_COMPUTE_DETAIL_ASSIGN_DIM
  62 #undef BOOST_COMPUTE_DETAIL_DEFINE_DIM
  63
  64 #endif // BOOST_COMPUTE_NO_VARIADIC_TEMPLATES
  65
  66 /// \internal_
  67 template<size_t N>
  68 inline extents<N> dim()
  69 {
  70     return extents<N>();
  71 }
  72
  73 } // end compute namespace
  74 } // end boost namespace
  75
  76 #endif // BOOST_COMPUTE_UTILITY_DIM_HPP