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80 lines
2.1 KiB
80 lines
2.1 KiB
#ifndef BOOST_ARCHIVE_ITERATORS_HEAD_ITERATOR_HPP |
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#define BOOST_ARCHIVE_ITERATORS_HEAD_ITERATOR_HPP |
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// MS compatible compilers support #pragma once |
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#if defined(_MSC_VER) && (_MSC_VER >= 1020) |
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# pragma once |
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#endif |
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/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 |
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// head_iterator.hpp |
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// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . |
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// Use, modification and distribution is subject to the Boost Software |
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// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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// See http://www.boost.org for updates, documentation, and revision history. |
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#include <boost/iterator/iterator_adaptor.hpp> |
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#include <boost/iterator/iterator_traits.hpp> |
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namespace boost { |
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namespace archive { |
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namespace iterators { |
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template<class Predicate, class Base> |
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class head_iterator |
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: public boost::iterator_adaptor< |
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head_iterator<Predicate, Base>, |
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Base, |
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use_default, |
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single_pass_traversal_tag |
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> |
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{ |
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private: |
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friend class iterator_core_access; |
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typedef boost::iterator_adaptor< |
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head_iterator<Predicate, Base>, |
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Base, |
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use_default, |
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single_pass_traversal_tag |
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> super_t; |
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typedef head_iterator<Predicate, Base> this_t; |
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typedef BOOST_DEDUCED_TYPENAME super_t::value_type value_type; |
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typedef BOOST_DEDUCED_TYPENAME super_t::reference reference_type; |
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reference_type dereference_impl(){ |
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if(! m_end){ |
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while(! m_predicate(* this->base_reference())) |
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++ this->base_reference(); |
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m_end = true; |
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} |
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return * this->base_reference(); |
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} |
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reference_type dereference() const { |
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return const_cast<this_t *>(this)->dereference_impl(); |
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} |
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void increment(){ |
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++base_reference(); |
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} |
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Predicate m_predicate; |
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bool m_end; |
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public: |
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template<class T> |
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head_iterator(Predicate f, T start) : |
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super_t(Base(start)), |
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m_predicate(f), |
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m_end(false) |
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{} |
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}; |
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} // namespace iterators |
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} // namespace archive |
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} // namespace boost |
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#endif // BOOST_ARCHIVE_ITERATORS_HEAD_ITERATOR_HPP
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