89 lines
2.7 KiB
C++
89 lines
2.7 KiB
C++
/*=============================================================================
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Copyright (c) 2001-2011 Joel de Guzman
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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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#if !defined(SPIRIT_PERMUTE_FUNCTION_MARCH_13_2007_1129AM)
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#define SPIRIT_PERMUTE_FUNCTION_MARCH_13_2007_1129AM
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#if defined(_MSC_VER)
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#pragma once
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#endif
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#include <boost/spirit/home/support/unused.hpp>
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#include <boost/optional.hpp>
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namespace boost { namespace spirit { namespace qi { namespace detail
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{
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template <typename Iterator, typename Context, typename Skipper>
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struct permute_function
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{
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permute_function(
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Iterator& first, Iterator const& last
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, Context& context, Skipper const& skipper)
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: first(first)
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, last(last)
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, context(context)
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, skipper(skipper)
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{
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}
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template <typename Component, typename Attribute>
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bool operator()(Component const& component, Attribute& attr)
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{
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// return true if the parser succeeds and the slot is not yet taken
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if (!*taken && component.parse(first, last, context, skipper, attr))
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{
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*taken = true;
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++taken;
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return true;
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}
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++taken;
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return false;
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}
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template <typename Component, typename Attribute>
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bool operator()(Component const& component, boost::optional<Attribute>& attr)
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{
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// return true if the parser succeeds and the slot is not yet taken
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Attribute val;
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if (!*taken && component.parse(first, last, context, skipper, val))
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{
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attr = val;
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*taken = true;
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++taken;
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return true;
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}
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++taken;
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return false;
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}
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template <typename Component>
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bool operator()(Component const& component)
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{
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// return true if the parser succeeds and the slot is not yet taken
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if (!*taken && component.parse(first, last, context, skipper, unused))
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{
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*taken = true;
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++taken;
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return true;
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}
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++taken;
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return false;
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}
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Iterator& first;
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Iterator const& last;
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Context& context;
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Skipper const& skipper;
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bool* taken;
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private:
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// silence MSVC warning C4512: assignment operator could not be generated
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permute_function& operator= (permute_function const&);
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};
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}}}}
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#endif
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