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