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95 lines
2.6 KiB
95 lines
2.6 KiB
#ifndef BOOST_ARCHIVE_ITERATORS_ISTREAM_ITERATOR_HPP |
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#define BOOST_ARCHIVE_ITERATORS_ISTREAM_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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// istream_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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// note: this is a custom version of the standard istream_iterator. |
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// This is necessary as the standard version doesn't work as expected |
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// for wchar_t based streams on systems for which wchar_t not a true |
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// type but rather a synonym for some integer type. |
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#include <cstddef> // NULL |
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#include <istream> |
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#include <boost/iterator/iterator_facade.hpp> |
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namespace boost { |
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namespace archive { |
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namespace iterators { |
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// given a type, make an input iterator based on a pointer to that type |
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template<class Elem = char> |
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class istream_iterator : |
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public boost::iterator_facade< |
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istream_iterator<Elem>, |
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Elem, |
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std::input_iterator_tag, |
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Elem |
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> |
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{ |
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friend class boost::iterator_core_access; |
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typedef istream_iterator this_t ; |
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typedef BOOST_DEDUCED_TYPENAME boost::iterator_facade< |
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istream_iterator<Elem>, |
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Elem, |
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std::input_iterator_tag, |
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Elem |
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> super_t; |
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typedef BOOST_DEDUCED_TYPENAME std::basic_istream<Elem> istream_type; |
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//Access the value referred to |
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Elem dereference() const { |
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return m_current_value; |
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} |
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bool equal(const this_t & rhs) const { |
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// note: only works for comparison against end of stream |
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return m_istream == rhs.m_istream; |
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} |
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void increment(){ |
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if(NULL != m_istream){ |
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m_current_value = static_cast<Elem>(m_istream->get()); |
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if(! m_istream->good()){ |
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const_cast<this_t *>(this)->m_istream = NULL; |
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} |
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} |
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} |
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istream_type *m_istream; |
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Elem m_current_value; |
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public: |
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istream_iterator(istream_type & is) : |
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m_istream(& is) |
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{ |
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increment(); |
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} |
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istream_iterator() : |
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m_istream(NULL) |
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{} |
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istream_iterator(const istream_iterator<Elem> & rhs) : |
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m_istream(rhs.m_istream), |
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m_current_value(rhs.m_current_value) |
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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_ISTREAM_ITERATOR_HPP
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