71 lines
2.2 KiB
C++
71 lines
2.2 KiB
C++
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//---------------------------------------------------------------------------//
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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_LAMBDA_MAKE_PAIR_HPP
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#define BOOST_COMPUTE_LAMBDA_MAKE_PAIR_HPP
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#include <boost/compute/types/pair.hpp>
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namespace boost {
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namespace compute {
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namespace lambda {
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namespace detail {
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// function wrapper for make_pair() in lambda expressions
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struct make_pair_func
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{
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template<class Expr, class Args>
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struct lambda_result
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{
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typedef typename proto::result_of::child_c<Expr, 1>::type Arg1;
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typedef typename proto::result_of::child_c<Expr, 2>::type Arg2;
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typedef typename lambda::result_of<Arg1, Args>::type T1;
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typedef typename lambda::result_of<Arg2, Args>::type T2;
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typedef std::pair<T1, T2> type;
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};
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template<class Context, class Arg1, class Arg2>
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static void apply(Context &ctx, const Arg1 &arg1, const Arg2 &arg2)
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{
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typedef typename lambda::result_of<Arg1, typename Context::args_tuple>::type T1;
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typedef typename lambda::result_of<Arg2, typename Context::args_tuple>::type T2;
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ctx.stream << "boost_make_pair(";
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ctx.stream << type_name<T1>() << ", ";
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proto::eval(arg1, ctx);
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ctx.stream << ", ";
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ctx.stream << type_name<T2>() << ", ";
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proto::eval(arg2, ctx);
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ctx.stream << ")";
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}
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};
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} // end detail namespace
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// make_pair(first, second)
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template<class Arg1, class Arg2>
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inline typename proto::result_of::make_expr<
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proto::tag::function, detail::make_pair_func, const Arg1&, const Arg2&
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>::type const
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make_pair(const Arg1 &first, const Arg2 &second)
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{
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return proto::make_expr<proto::tag::function>(
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detail::make_pair_func(), ::boost::ref(first), ::boost::ref(second)
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);
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}
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} // end lambda namespace
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} // end compute namespace
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} // end boost namespace
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#endif // BOOST_COMPUTE_LAMBDA_MAKE_PAIR_HPP
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