77 lines
2.2 KiB
C++
77 lines
2.2 KiB
C++
//---------------------------------------------------------------------------//
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// Copyright (c) 2013-2014 Kyle Lutz <kyle.r.lutz@gmail.com>
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//
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// Distributed under the Boost Software License, Version 1.0
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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//
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// See http://boostorg.github.com/compute for more information.
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//---------------------------------------------------------------------------//
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#ifndef BOOST_COMPUTE_UTILITY_DIM_HPP
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#define BOOST_COMPUTE_UTILITY_DIM_HPP
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#include <boost/compute/config.hpp>
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#include <boost/compute/utility/extents.hpp>
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namespace boost {
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namespace compute {
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#ifndef BOOST_COMPUTE_NO_VARIADIC_TEMPLATES
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/// The variadic \c dim() function provides a concise syntax for creating
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/// \ref extents objects.
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///
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/// For example,
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/// \code
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/// extents<2> region = dim(640, 480); // region == (640, 480)
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/// \endcode
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///
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/// \see \ref extents "extents<N>"
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template<class... Args>
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inline extents<sizeof...(Args)> dim(Args... args)
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{
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return extents<sizeof...(Args)>({ static_cast<size_t>(args)... });
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}
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#if BOOST_WORKAROUND(BOOST_MSVC, <= 1800)
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// for some inexplicable reason passing one parameter to 'dim' variadic template
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// generates compile error on msvc 2013 update 4
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template<class T>
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inline extents<1> dim(T arg)
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{
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return extents<1>(static_cast<size_t>(arg));
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}
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#endif // BOOST_WORKAROUND(BOOST_MSVC, <= 1800)
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#else
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// dim() function definitions for non-c++11 compilers
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#define BOOST_COMPUTE_DETAIL_ASSIGN_DIM(z, n, var) \
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var[n] = BOOST_PP_CAT(e, n);
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#define BOOST_COMPUTE_DETAIL_DEFINE_DIM(z, n, var) \
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inline extents<n> dim(BOOST_PP_ENUM_PARAMS(n, size_t e)) \
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{ \
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extents<n> exts; \
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BOOST_PP_REPEAT(n, BOOST_COMPUTE_DETAIL_ASSIGN_DIM, exts) \
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return exts; \
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}
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BOOST_PP_REPEAT(BOOST_COMPUTE_MAX_ARITY, BOOST_COMPUTE_DETAIL_DEFINE_DIM, ~)
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#undef BOOST_COMPUTE_DETAIL_ASSIGN_DIM
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#undef BOOST_COMPUTE_DETAIL_DEFINE_DIM
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#endif // BOOST_COMPUTE_NO_VARIADIC_TEMPLATES
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/// \internal_
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template<size_t N>
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inline extents<N> dim()
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{
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return extents<N>();
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}
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} // end compute namespace
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} // end boost namespace
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#endif // BOOST_COMPUTE_UTILITY_DIM_HPP
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