[857] | 1 | #ifndef BOOST_ARCHIVE_ITERATORS_ISTREAM_ITERATOR_HPP
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| 2 | #define BOOST_ARCHIVE_ITERATORS_ISTREAM_ITERATOR_HPP
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| 3 |
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| 4 | // MS compatible compilers support #pragma once
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| 5 | #if defined(_MSC_VER) && (_MSC_VER >= 1020)
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| 6 | # pragma once
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| 7 | #endif
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| 8 |
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| 9 | /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
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| 10 | // istream_iterator.hpp
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| 11 |
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| 12 | // (C) Copyright 2002 Robert Ramey - http://www.rrsd.com .
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| 13 | // Use, modification and distribution is subject to the Boost Software
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| 14 | // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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| 15 | // http://www.boost.org/LICENSE_1_0.txt)
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| 16 |
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| 17 | // See http://www.boost.org for updates, documentation, and revision history.
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| 18 |
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| 19 | // note: this is a custom version of the standard istream_iterator.
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| 20 | // This is necessary as the standard version doesn't work as expected
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| 21 | // for wchar_t based streams on systems for which wchar_t not a true
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| 22 | // type but rather a synonym for some integer type.
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| 23 |
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| 24 | #include <istream>
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| 25 | #include <boost/iterator/iterator_facade.hpp>
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| 26 |
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| 27 | namespace boost {
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| 28 | namespace archive {
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| 29 | namespace iterators {
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| 30 |
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| 31 | // given a type, make an input iterator based on a pointer to that type
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| 32 | template<class Elem = char>
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| 33 | class istream_iterator :
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| 34 | public boost::iterator_facade<
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| 35 | istream_iterator<Elem>,
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| 36 | Elem,
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| 37 | std::input_iterator_tag,
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| 38 | Elem
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| 39 | >
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| 40 | {
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| 41 | friend class boost::iterator_core_access;
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| 42 | typedef istream_iterator this_t ;
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| 43 | typedef BOOST_DEDUCED_TYPENAME boost::iterator_facade<
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| 44 | istream_iterator<Elem>,
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| 45 | Elem,
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| 46 | std::input_iterator_tag,
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| 47 | Elem
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| 48 | > super_t;
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| 49 | typedef BOOST_DEDUCED_TYPENAME std::basic_istream<Elem> istream_type;
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| 50 |
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| 51 | //Access the value referred to
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| 52 | Elem dereference() const {
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| 53 | return m_current_value;
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| 54 | }
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| 55 |
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| 56 | bool equal(const this_t & rhs) const {
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| 57 | // note: only works for comparison against end of stream
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| 58 | return m_istream == rhs.m_istream;
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| 59 | }
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| 60 |
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| 61 | void increment(){
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| 62 | if(NULL != m_istream){
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| 63 | m_current_value = m_istream->get();
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| 64 | if(! m_istream->good()){
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| 65 | const_cast<this_t *>(this)->m_istream = NULL;
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| 66 | }
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| 67 | }
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| 68 | }
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| 69 |
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| 70 | istream_type *m_istream;
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| 71 | Elem m_current_value;
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| 72 | public:
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| 73 | istream_iterator(istream_type & is) :
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| 74 | m_istream(& is)
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| 75 | {
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| 76 | increment();
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| 77 | }
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| 78 |
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| 79 | istream_iterator() :
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| 80 | m_istream(NULL)
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| 81 | {}
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| 82 |
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| 83 | istream_iterator(const istream_iterator<Elem> & rhs) :
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| 84 | m_istream(rhs.m_istream),
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| 85 | m_current_value(rhs.m_current_value)
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| 86 | {}
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| 87 |
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| 88 | };
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| 89 |
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| 90 | } // namespace iterators
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| 91 | } // namespace archive
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| 92 | } // namespace boost
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| 93 |
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| 94 | #endif // BOOST_ARCHIVE_ITERATORS_ISTREAM_ITERATOR_HPP
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