/Src/Dependencies/Boost/boost/spirit/home/qi/detail/permute_function.hpp
http://hadesmem.googlecode.com/ · C++ Header · 88 lines · 69 code · 9 blank · 10 comment · 6 complexity · 9dc554a487b5d8ad607383e0c5c01ec1 MD5 · raw file
- /*=============================================================================
- 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, typename Attribute>
- bool operator()(Component const& component, boost::optional<Attribute>& attr)
- {
- // return true if the parser succeeds and the slot is not yet taken
- Attribute val;
- if (!*taken && component.parse(first, last, context, skipper, val))
- {
- attr = val;
- *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;
- private:
- // silence MSVC warning C4512: assignment operator could not be generated
- permute_function& operator= (permute_function const&);
- };
- }}}}
- #endif