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