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88 lines
2.7 KiB
88 lines
2.7 KiB
/*============================================================================= |
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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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