mirror of http://192.168.1.51:8099/lmh188/twain3.0
72 lines
2.7 KiB
C++
72 lines
2.7 KiB
C++
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//---------------------------------------------------------------------------//
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// Copyright (c) 2013-2015 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://kylelutz.github.com/compute for more information.
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//---------------------------------------------------------------------------//
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#ifndef BOOST_COMPUTE_UTILITY_INVOKE_HPP
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#define BOOST_COMPUTE_UTILITY_INVOKE_HPP
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#include <boost/preprocessor/enum.hpp>
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#include <boost/preprocessor/repetition.hpp>
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#include <boost/compute/config.hpp>
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#include <boost/compute/command_queue.hpp>
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#include <boost/compute/detail/meta_kernel.hpp>
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#include <boost/compute/container/detail/scalar.hpp>
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#include <boost/compute/type_traits/result_of.hpp>
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namespace boost {
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namespace compute {
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#define BOOST_COMPUTE_DETAIL_INVOKE_ARG(z, n, unused) \
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BOOST_PP_COMMA_IF(n) k.var<BOOST_PP_CAT(T, n)>("arg" BOOST_PP_STRINGIZE(n))
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#define BOOST_COMPUTE_DETAIL_INVOKE_ADD_ARG(z, n, unused) \
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k.add_set_arg("arg" BOOST_PP_STRINGIZE(n), BOOST_PP_CAT(arg, n));
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#define BOOST_COMPUTE_DETAIL_DEFINE_INVOKE(z, n, unused) \
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template<class Function, BOOST_PP_ENUM_PARAMS(n, class T)> \
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inline typename result_of<Function(BOOST_PP_ENUM_PARAMS(n, T))>::type \
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invoke(const Function& function, command_queue& queue, BOOST_PP_ENUM_BINARY_PARAMS(n, const T, &arg)) \
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{ \
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typedef typename result_of<Function(BOOST_PP_ENUM_PARAMS(n, T))>::type result_type; \
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detail::meta_kernel k("invoke"); \
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detail::scalar<result_type> result(queue.get_context()); \
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const size_t result_arg = k.add_arg<result_type *>(memory_object::global_memory, "result"); \
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BOOST_PP_REPEAT(n, BOOST_COMPUTE_DETAIL_INVOKE_ADD_ARG, ~) \
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k << "*result = " << function( \
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BOOST_PP_REPEAT(n, BOOST_COMPUTE_DETAIL_INVOKE_ARG, ~) \
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) << ";"; \
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k.set_arg(result_arg, result.get_buffer()); \
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k.exec(queue); \
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return result.read(queue); \
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}
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BOOST_PP_REPEAT_FROM_TO(1, BOOST_COMPUTE_MAX_ARITY, BOOST_COMPUTE_DETAIL_DEFINE_INVOKE, ~)
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#undef BOOST_COMPUTE_DETAIL_INVOKE_ARG
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#undef BOOST_COMPUTE_DETAIL_INVOKE_ADD_ARG
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#undef BOOST_COMPUTE_DETAIL_DEFINE_INVOKE
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#ifdef BOOST_COMPUTE_DOXYGEN_INVOKED
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/// Invokes \p function with \p args on \p queue.
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///
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/// For example, to invoke the builtin abs() function:
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/// \code
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/// int result = invoke(abs<int>(), queue, -10); // returns 10
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/// \endcode
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template<class Function, class... Args>
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inline typename result_of<Function(Args...)>::type
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invoke(const Function& function, command_queue& queue, const Args&... args);
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#endif // BOOST_COMPUTE_DOXYGEN_INVOKED
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} // end compute namespace
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} // end boost namespace
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#endif // BOOST_COMPUTE_UTILITY_INVOKE_HPP
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