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/*=============================================================================
Copyright (c) 2001-2007 Joel de Guzman
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)
==============================================================================*/
#include <boost/phoenix.hpp>
struct omp_for_eval
{
typedef void result_type;
template <typename Init, typename Cond, typename Step, typename Do, typename Context>
result_type
operator()(
Init const& init
, Cond const& cond
, Step const& step
, Do const& do_
, Context & ctx
) const
{
#pragma omp parallel
for(
boost::phoenix::eval(init, ctx);
boost::phoenix::eval(cond, ctx);
boost::phoenix::eval(step, ctx)
)
{
boost::phoenix::eval(do_, ctx);
}
}
};
////////////////////////////////////////////////////////////////////////////////
// Define new custom expression
BOOST_PHOENIX_DEFINE_EXPRESSION(
(omp_for)
, (boost::phoenix::meta_grammar) // Cond
(boost::phoenix::meta_grammar) // Init
(boost::phoenix::meta_grammar) // Step
(boost::phoenix::meta_grammar) // Do
)
namespace boost { namespace phoenix
{
template <>
struct default_actions::when< ::rule::omp_for>
: boost::phoenix::call< ::omp_for_eval>
{};
}}
template <typename Init, typename Cond, typename Step>
struct omp_for_gen
{
omp_for_gen(Init const& init, Cond const& cond, Step const& step)
: init(init), cond(cond), step(step) {}
template <typename Do>
typename result_of::make_omp_for<Init, Cond, Step, Do>::type const
operator[](Do const& do_) const
{
return make_omp_for(init, cond, step, do_);
}
Init init;
Cond cond;
Step step;
};
template <typename Init, typename Cond, typename Step>
inline
omp_for_gen<Init, Cond, Step> const
omp_for(Init const& init, Cond const& cond, Step const& step)
{
return omp_for_gen<Init, Cond, Step>(init, cond, step);
}
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
// Define new evaluation scheme
struct parallel_actions
{
template <typename Rule>
struct when
: boost::phoenix::default_actions::when<Rule>
{};
};
template <>
struct parallel_actions::when<boost::phoenix::rule::for_>
: boost::phoenix::call<omp_for_eval>
{};
// Doing the same as actor<Expr>::operator
template <typename Expr, typename A0, typename A1, typename A2>
typename boost::phoenix::result_of::eval<
Expr const &
, typename boost::phoenix::result_of::make_context<
typename boost::phoenix::result_of::make_env<
Expr const *
, A0 &
, A1 &
, A2 &
>::type
, parallel_actions
>::type
>::type
parallel_eval(Expr & expr, A0 & a0, A1 & a1, A2 & a2)
{
Expr const * this_ = boost::addressof(expr);
return
boost::phoenix::eval(
expr
, boost::phoenix::make_context(
boost::phoenix::make_env(this_, a0, a1, a2)
, parallel_actions()
)
);
}
// changing evaluation mechanism on the fly
BOOST_PHOENIX_DEFINE_EXPRESSION(
(parallel)
, (boost::phoenix::meta_grammar)
)
namespace boost { namespace phoenix
{
template <>
struct default_actions::when< ::rule::parallel>
: proto::call<
evaluator(
proto::_child0
, functional::make_context(
_env
, parallel_actions()
)
, unused()//mpl::void_()
)
>
{};
}}
template <typename Expr>
typename result_of::make_parallel<Expr>::type
parallel(Expr const & expr)
{
return make_parallel(expr);
}
////////////////////////////////////////////////////////////////////////////////
#include <vector>
#include <iostream>
int main()
{
using boost::phoenix::arg_names::_1;
using boost::phoenix::arg_names::_2;
using boost::phoenix::arg_names::_3;
using boost::phoenix::local_names::_a;
using boost::phoenix::local_names::_b;
using boost::phoenix::local_names::_c;
using boost::phoenix::let;
using boost::phoenix::bind;
using boost::phoenix::lambda;
using boost::phoenix::nothing;
const int NUM = 1;
{
std::vector<int> a(NUM, 1);
std::vector<int> b(NUM, 2);
std::vector<int> c(NUM, 0);
(
let(_a = begin(_1), _b = begin(_2), _c = begin(_3))
[
for_(nothing, _a != end(_1), (++_a, ++_b, ++_c))
[
*_c = *_a + *_b
]
]
, std::cout << accumulate(_3, 0) << "\n"
)(a, b, c);
}
{
std::vector<int> a(NUM, 1);
std::vector<int> b(NUM, 2);
std::vector<int> c(NUM, 0);
(
let(_a = begin(_1), _b = begin(_2), _c = begin(_3))
[
omp_for(nothing, _a != end(_1), (++_a, ++_b, ++_c))
[
*_c = *_a + *_b
]
, std::cout << accumulate(_3, 0) << "\n"
]
)(a, b, c);
}
{
std::vector<int> a(NUM, 1);
std::vector<int> b(NUM, 2);
std::vector<int> c(NUM, 0);
parallel_eval(
let(_a = begin(_1), _b = begin(_2), _c = begin(_3))
[
for_(nothing, _a != end(_1), (++_a, ++_b, ++_c))
[
*_c = *_a + *_b
]
, std::cout << accumulate(_3, 0) << "\n"
]
, a, b, c);
}
{
std::vector<int> a(NUM, 1);
std::vector<int> b(NUM, 2);
std::vector<int> c(NUM, 0);
(
let(_a = begin(_1), _b = begin(_2), _c = begin(_3))
[
parallel(
for_(nothing, _a != end(_1), (++_a, ++_b, ++_c))
[
*_c = *_a + *_b
]
)
]
, std::cout << accumulate(_3, 0) << "\n"
)(a, b, c);
}
}
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