81 lines
2.1 KiB
C++
81 lines
2.1 KiB
C++
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#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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