ceph/src/boost/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 #ifndef BOOST_NO_CWCHAR
  22 #include <cwchar> //  mbstate_t
  23 #endif
  24 #include <boost/config.hpp>
  25 #if defined(BOOST_NO_STDC_NAMESPACE)
  26 namespace std{
  27     using ::mbstate_t;
  28 } // namespace std
  29 #endif
  30
  31 #include <boost/archive/detail/utf8_codecvt_facet.hpp>
  32 #include <boost/iterator/iterator_adaptor.hpp>
  33
  34 namespace boost {
  35 namespace archive {
  36 namespace iterators {
  37
  38 /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
  39 // class used by text archives to translate wide strings and to char
  40 // strings of the currently selected locale
  41 template<class Base>    // the input iterator
  42 class mb_from_wchar
  43     : public boost::iterator_adaptor<
  44         mb_from_wchar<Base>,
  45         Base,
  46         wchar_t,
  47         single_pass_traversal_tag,
  48         char
  49     >
  50 {
  51     friend class boost::iterator_core_access;
  52
  53     typedef typename boost::iterator_adaptor<
  54         mb_from_wchar<Base>,
  55         Base,
  56         wchar_t,
  57         single_pass_traversal_tag,
  58         char
  59     > super_t;
  60
  61     typedef mb_from_wchar<Base> this_t;
  62
  63     char dereference_impl() {
  64         if(! m_full){
  65             fill();
  66             m_full = true;
  67         }
  68         return m_buffer[m_bnext];
  69     }
  70
  71     char dereference() const {
  72         return (const_cast<this_t *>(this))->dereference_impl();
  73     }
  74     // test for iterator equality
  75     bool equal(const mb_from_wchar<Base> & rhs) const {
  76         // once the value is filled, the base_reference has been incremented
  77         // so don't permit comparison anymore.
  78         return
  79             0 == m_bend
  80             && 0 == m_bnext
  81             && this->base_reference() == rhs.base_reference()
  82         ;
  83     }
  84
  85     void fill(){
  86         wchar_t value = * this->base_reference();
  87         const wchar_t *wend;
  88         char *bend;
  89         BOOST_VERIFY(
  90             m_codecvt_facet.out(
  91                 m_mbs,
  92                 & value, & value + 1, wend,
  93                 m_buffer, m_buffer + sizeof(m_buffer), bend
  94             )
  95             ==
  96             std::codecvt_base::ok
  97         );
  98         m_bnext = 0;
  99         m_bend = bend - m_buffer;
 100     }
 101
 102     void increment(){
 103         if(++m_bnext < m_bend)
 104             return;
 105         m_bend =
 106         m_bnext = 0;
 107         ++(this->base_reference());
 108         m_full = false;
 109     }
 110
 111     boost::archive::detail::utf8_codecvt_facet m_codecvt_facet;
 112     std::mbstate_t m_mbs;
 113     // buffer to handle pending characters
 114     char m_buffer[9 /* MB_CUR_MAX */];
 115     std::size_t m_bend;
 116     std::size_t m_bnext;
 117     bool m_full;
 118
 119 public:
 120     // make composible buy using templated constructor
 121     template<class T>
 122     mb_from_wchar(T start) :
 123         super_t(Base(static_cast< T >(start))),
 124         m_mbs(std::mbstate_t()),
 125         m_bend(0),
 126         m_bnext(0),
 127         m_full(false)
 128     {}
 129     // intel 7.1 doesn't like default copy constructor
 130     mb_from_wchar(const mb_from_wchar & rhs) :
 131         super_t(rhs.base_reference()),
 132         m_bend(rhs.m_bend),
 133         m_bnext(rhs.m_bnext),
 134         m_full(rhs.m_full)
 135     {}
 136 };
 137
 138 } // namespace iterators
 139 } // namespace archive
 140 } // namespace boost
 141
 142 #endif // BOOST_ARCHIVE_ITERATORS_MB_FROM_WCHAR_HPP