96 lines
2.6 KiB
C++
96 lines
2.6 KiB
C++
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#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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