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