// Copyright (c) 2001, Daniel C. Nuffer
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// Copyright (c) 2001-2011 Hartmut Kaiser
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// http://spirit.sourceforge.net/
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//
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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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#if !defined(BOOST_SPIRIT_ITERATOR_LOOK_AHEAD_MAR_16_2007_1253PM)
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#define BOOST_SPIRIT_ITERATOR_LOOK_AHEAD_MAR_16_2007_1253PM
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#include <boost/spirit/home/support/iterators/detail/first_owner_policy.hpp>
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#include <boost/spirit/home/support/iterators/detail/no_check_policy.hpp>
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#include <boost/spirit/home/support/iterators/detail/input_iterator_policy.hpp>
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#include <boost/spirit/home/support/iterators/detail/fixed_size_queue_policy.hpp>
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#include <boost/spirit/home/support/iterators/detail/combine_policies.hpp>
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#include <boost/spirit/home/support/iterators/multi_pass.hpp>
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namespace boost { namespace spirit
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{
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///////////////////////////////////////////////////////////////////////////
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// this could be a template typedef, since such a thing doesn't
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// exist in C++, we'll use inheritance to accomplish the same thing.
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///////////////////////////////////////////////////////////////////////////
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template <typename T, std::size_t N>
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class look_ahead :
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public multi_pass<T
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, iterator_policies::default_policy<
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iterator_policies::first_owner
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, iterator_policies::no_check
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, iterator_policies::input_iterator
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, iterator_policies::fixed_size_queue<N> >
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>
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{
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private:
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typedef multi_pass<T
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, iterator_policies::default_policy<
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iterator_policies::first_owner
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, iterator_policies::no_check
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, iterator_policies::input_iterator
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, iterator_policies::fixed_size_queue<N> >
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> base_type;
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public:
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look_ahead()
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: base_type() {}
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explicit look_ahead(T x)
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: base_type(x) {}
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look_ahead(look_ahead const& x)
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: base_type(x) {}
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#if BOOST_WORKAROUND(__GLIBCPP__, == 20020514)
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look_ahead(int) // workaround for a bug in the library
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: base_type() {} // shipped with gcc 3.1
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#endif // BOOST_WORKAROUND(__GLIBCPP__, == 20020514)
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look_ahead operator= (base_type const& rhs)
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{
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this->base_type::operator=(rhs);
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return *this;
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}
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// default generated operators destructor and assignment operator are ok.
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};
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}}
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#endif
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