88 lines
2.5 KiB
C++
88 lines
2.5 KiB
C++
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/*==============================================================================
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Copyright (c) 2001-2010 Joel de Guzman
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Copyright (c) 2010 Thomas Heller
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#ifndef BOOST_PHOENIX_STATEMENT_FOR_HPP
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#define BOOST_PHOENIX_STATEMENT_FOR_HPP
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#include <boost/phoenix/core/limits.hpp>
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#include <boost/phoenix/core/call.hpp>
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#include <boost/phoenix/core/expression.hpp>
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#include <boost/phoenix/core/meta_grammar.hpp>
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BOOST_PHOENIX_DEFINE_EXPRESSION(
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(boost)(phoenix)(for_)
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, (meta_grammar) // Cond
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(meta_grammar) // Init
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(meta_grammar) // Step
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(meta_grammar) // Do
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)
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namespace boost { namespace phoenix
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{
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struct for_eval
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{
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typedef void result_type;
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template <
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typename Init
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, typename Cond
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, typename Step
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, typename Do
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, typename Context
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>
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result_type
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operator()(
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Init const& init
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, Cond const& cond
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, Step const& step
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, Do const& do_it
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, Context const & ctx
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) const
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{
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for(boost::phoenix::eval(init, ctx); boost::phoenix::eval(cond, ctx); boost::phoenix::eval(step, ctx))
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boost::phoenix::eval(do_it, ctx);
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}
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};
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template <typename Dummy>
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struct default_actions::when<rule::for_, Dummy>
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: call<for_eval, Dummy>
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{};
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template <typename Init, typename Cond, typename Step>
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struct for_gen
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{
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for_gen(Init const& init_, Cond const& cond_, Step const& step_)
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: init(init_), cond(cond_), step(step_) {}
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template <typename Do>
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typename expression::for_<Init, Cond, Step, Do>::type const
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operator[](Do const& do_it) const
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{
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return
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expression::
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for_<Init, Cond, Step, Do>::
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make(init, cond, step, do_it);
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}
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Init init;
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Cond cond;
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Step step;
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};
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template <typename Init, typename Cond, typename Step>
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inline
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for_gen<Init, Cond, Step> const
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for_(Init const& init, Cond const& cond, Step const& step)
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{
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return for_gen<Init, Cond, Step>(init, cond, step);
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}
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}}
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#endif
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