71 lines
1.9 KiB
C++
71 lines
1.9 KiB
C++
/*==============================================================================
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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_WHILE_HPP
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#define BOOST_PHOENIX_STATEMENT_WHILE_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)(while_)
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, (meta_grammar) // Cond
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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 while_eval
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{
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typedef void result_type;
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template <typename Cond, typename Do, typename Context>
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result_type
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operator()(Cond const& cond, Do const& do_it, Context const & ctx) const
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{
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while(boost::phoenix::eval(cond, ctx))
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{
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boost::phoenix::eval(do_it, ctx);
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}
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}
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};
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template <typename Dummy>
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struct default_actions::when<rule::while_, Dummy>
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: call<while_eval, Dummy>
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{};
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template <typename Cond>
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struct while_gen
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{
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while_gen(Cond const& cond_) : cond(cond_) {}
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template <typename Do>
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typename expression::while_<Cond, Do>::type const
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operator[](Do const& do_it) const
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{
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return expression::while_<Cond, Do>::make(cond, do_it);
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}
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Cond const& cond;
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};
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template <typename Cond>
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inline
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while_gen<Cond> const
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while_(Cond const& cond)
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{
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return while_gen<Cond>(cond);
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}
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}}
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#endif
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