ceph/src/boost/libs/serialization/include/boost/archive/iterators/mb_from_wchar.hpp

   1 #ifndef BOOST_ARCHIVE_ITERATORS_MB_FROM_WCHAR_HPP
   2 #define BOOST_ARCHIVE_ITERATORS_MB_FROM_WCHAR_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 // mb_from_wchar.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 #include <boost/assert.hpp>
  20 #include <cstddef> // size_t
  21 #include <cwchar> //  mbstate_t
  22
  23 #include <boost/config.hpp>
  24 #if defined(BOOST_NO_STDC_NAMESPACE)
  25 namespace std{
  26     using ::mbstate_t;
  27 } // namespace std
  28 #endif
  29 #include <boost/archive/detail/utf8_codecvt_facet.hpp>
  30 #include <boost/iterator/iterator_adaptor.hpp>
  31
  32 namespace boost {
  33 namespace archive {
  34 namespace iterators {
  35
  36 /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
  37 // class used by text archives to translate wide strings and to char
  38 // strings of the currently selected locale
  39 template<class Base>    // the input iterator
  40 class mb_from_wchar
  41     : public boost::iterator_adaptor<
  42         mb_from_wchar<Base>,
  43         Base,
  44         wchar_t,
  45         single_pass_traversal_tag,
  46         char
  47     >
  48 {
  49     friend class boost::iterator_core_access;
  50
  51     typedef typename boost::iterator_adaptor<
  52         mb_from_wchar<Base>,
  53         Base,
  54         wchar_t,
  55         single_pass_traversal_tag,
  56         char
  57     > super_t;
  58
  59     typedef mb_from_wchar<Base> this_t;
  60
  61     char dereference_impl() {
  62         if(! m_full){
  63             fill();
  64             m_full = true;
  65         }
  66         return m_buffer[m_bnext];
  67     }
  68
  69     char dereference() const {
  70         return (const_cast<this_t *>(this))->dereference_impl();
  71     }
  72     // test for iterator equality
  73     bool equal(const mb_from_wchar<Base> & rhs) const {
  74         // once the value is filled, the base_reference has been incremented
  75         // so don't permit comparison anymore.
  76         return
  77             0 == m_bend
  78             && 0 == m_bnext
  79             && this->base_reference() == rhs.base_reference()
  80         ;
  81     }
  82
  83     void fill(){
  84         wchar_t value = * this->base_reference();
  85         const wchar_t *wend;
  86         char *bend;
  87         std::codecvt_base::result r = m_codecvt_facet.out(
  88             m_mbs,
  89             & value, & value + 1, wend,
  90             m_buffer, m_buffer + sizeof(m_buffer), bend
  91         );
  92         BOOST_ASSERT(std::codecvt_base::ok == r);
  93         m_bnext = 0;
  94         m_bend = bend - m_buffer;
  95     }
  96
  97     void increment(){
  98         if(++m_bnext < m_bend)
  99             return;
 100         m_bend =
 101         m_bnext = 0;
 102         ++(this->base_reference());
 103         m_full = false;
 104     }
 105
 106     boost::archive::detail::utf8_codecvt_facet m_codecvt_facet;
 107     std::mbstate_t m_mbs;
 108     // buffer to handle pending characters
 109     char m_buffer[9 /* MB_CUR_MAX */];
 110     std::size_t m_bend;
 111     std::size_t m_bnext;
 112     bool m_full;
 113
 114 public:
 115     // make composible buy using templated constructor
 116     template<class T>
 117     mb_from_wchar(T start) :
 118         super_t(Base(static_cast< T >(start))),
 119         m_mbs(std::mbstate_t()),
 120         m_bend(0),
 121         m_bnext(0),
 122         m_full(false)
 123     {}
 124     // intel 7.1 doesn't like default copy constructor
 125     mb_from_wchar(const mb_from_wchar & rhs) :
 126         super_t(rhs.base_reference()),
 127         m_bend(rhs.m_bend),
 128         m_bnext(rhs.m_bnext),
 129         m_full(rhs.m_full)
 130     {}
 131 };
 132
 133 } // namespace iterators
 134 } // namespace archive
 135 } // namespace boost
 136
 137 #endif // BOOST_ARCHIVE_ITERATORS_MB_FROM_WCHAR_HPP