71 lines
2.2 KiB
C++
71 lines
2.2 KiB
C++
//---------------------------------------------------------------------------//
|
|
// Copyright (c) 2013-2014 Kyle Lutz <kyle.r.lutz@gmail.com>
|
|
//
|
|
// Distributed under the Boost Software License, Version 1.0
|
|
// See accompanying file LICENSE_1_0.txt or copy at
|
|
// http://www.boost.org/LICENSE_1_0.txt
|
|
//
|
|
// See http://boostorg.github.com/compute for more information.
|
|
//---------------------------------------------------------------------------//
|
|
|
|
#ifndef BOOST_COMPUTE_LAMBDA_MAKE_PAIR_HPP
|
|
#define BOOST_COMPUTE_LAMBDA_MAKE_PAIR_HPP
|
|
|
|
#include <boost/compute/types/pair.hpp>
|
|
|
|
namespace boost {
|
|
namespace compute {
|
|
namespace lambda {
|
|
namespace detail {
|
|
|
|
// function wrapper for make_pair() in lambda expressions
|
|
struct make_pair_func
|
|
{
|
|
template<class Expr, class Args>
|
|
struct lambda_result
|
|
{
|
|
typedef typename proto::result_of::child_c<Expr, 1>::type Arg1;
|
|
typedef typename proto::result_of::child_c<Expr, 2>::type Arg2;
|
|
|
|
typedef typename lambda::result_of<Arg1, Args>::type T1;
|
|
typedef typename lambda::result_of<Arg2, Args>::type T2;
|
|
|
|
typedef std::pair<T1, T2> type;
|
|
};
|
|
|
|
template<class Context, class Arg1, class Arg2>
|
|
static void apply(Context &ctx, const Arg1 &arg1, const Arg2 &arg2)
|
|
{
|
|
typedef typename lambda::result_of<Arg1, typename Context::args_tuple>::type T1;
|
|
typedef typename lambda::result_of<Arg2, typename Context::args_tuple>::type T2;
|
|
|
|
ctx.stream << "boost_make_pair(";
|
|
ctx.stream << type_name<T1>() << ", ";
|
|
proto::eval(arg1, ctx);
|
|
ctx.stream << ", ";
|
|
ctx.stream << type_name<T2>() << ", ";
|
|
proto::eval(arg2, ctx);
|
|
ctx.stream << ")";
|
|
}
|
|
};
|
|
|
|
} // end detail namespace
|
|
|
|
// make_pair(first, second)
|
|
template<class Arg1, class Arg2>
|
|
inline typename proto::result_of::make_expr<
|
|
proto::tag::function, detail::make_pair_func, const Arg1&, const Arg2&
|
|
>::type const
|
|
make_pair(const Arg1 &first, const Arg2 &second)
|
|
{
|
|
return proto::make_expr<proto::tag::function>(
|
|
detail::make_pair_func(), ::boost::ref(first), ::boost::ref(second)
|
|
);
|
|
}
|
|
|
|
} // end lambda namespace
|
|
} // end compute namespace
|
|
} // end boost namespace
|
|
|
|
#endif // BOOST_COMPUTE_LAMBDA_MAKE_PAIR_HPP
|