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#ifndef BOOST_ARCHIVE_ITERATORS_MB_FROM_WCHAR_HPP
#define BOOST_ARCHIVE_ITERATORS_MB_FROM_WCHAR_HPP
// MS compatible compilers support #pragma once
#if defined(_MSC_VER)
# pragma once
#endif
/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
// mb_from_wchar.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.
#include <boost/assert.hpp>
#include <cstddef> // size_t
#include <cwchar> // mbstate_t
#include <boost/config.hpp>
#if defined(BOOST_NO_STDC_NAMESPACE)
namespace std{
using ::mbstate_t;
} // namespace std
#endif
#include <boost/archive/detail/utf8_codecvt_facet.hpp>
#include <boost/iterator/iterator_adaptor.hpp>
namespace boost {
namespace archive {
namespace iterators {
/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
// class used by text archives to translate wide strings and to char
// strings of the currently selected locale
template<class Base> // the input iterator
class mb_from_wchar
: public boost::iterator_adaptor<
mb_from_wchar<Base>,
Base,
wchar_t,
single_pass_traversal_tag,
char
>
{
friend class boost::iterator_core_access;
typedef typename boost::iterator_adaptor<
mb_from_wchar<Base>,
Base,
wchar_t,
single_pass_traversal_tag,
char
> super_t;
typedef mb_from_wchar<Base> this_t;
char dereference_impl() {
if(! m_full){
fill();
m_full = true;
}
return m_buffer[m_bnext];
}
char dereference() const {
return (const_cast<this_t *>(this))->dereference_impl();
}
// test for iterator equality
bool equal(const mb_from_wchar<Base> & rhs) const {
// once the value is filled, the base_reference has been incremented
// so don't permit comparison anymore.
return
0 == m_bend
&& 0 == m_bnext
&& this->base_reference() == rhs.base_reference()
;
}
void fill(){
wchar_t value = * this->base_reference();
const wchar_t *wend;
char *bend;
std::codecvt_base::result r = m_codecvt_facet.out(
m_mbs,
& value, & value + 1, wend,
m_buffer, m_buffer + sizeof(m_buffer), bend
);
BOOST_ASSERT(std::codecvt_base::ok == r);
m_bnext = 0;
m_bend = bend - m_buffer;
}
void increment(){
if(++m_bnext < m_bend)
return;
m_bend =
m_bnext = 0;
++(this->base_reference());
m_full = false;
}
boost::archive::detail::utf8_codecvt_facet m_codecvt_facet;
std::mbstate_t m_mbs;
// buffer to handle pending characters
char m_buffer[9 /* MB_CUR_MAX */];
std::size_t m_bend;
std::size_t m_bnext;
bool m_full;
public:
// make composible buy using templated constructor
template<class T>
mb_from_wchar(T start) :
super_t(Base(static_cast< T >(start))),
m_mbs(std::mbstate_t()),
m_bend(0),
m_bnext(0),
m_full(false)
{}
// intel 7.1 doesn't like default copy constructor
mb_from_wchar(const mb_from_wchar & rhs) :
super_t(rhs.base_reference()),
m_bend(rhs.m_bend),
m_bnext(rhs.m_bnext),
m_full(rhs.m_full)
{}
};
} // namespace iterators
} // namespace archive
} // namespace boost
#endif // BOOST_ARCHIVE_ITERATORS_MB_FROM_WCHAR_HPP
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