ceph/src/boost/boost/archive/iterators/istream_iterator.hpp

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