source: NonGTP/Boost/boost/archive/iterators/mb_from_wchar.hpp @ 857

Revision 857, 3.8 KB checked in by igarcia, 19 years ago (diff)
Line 
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) && (_MSC_VER >= 1020)
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 <cassert>
20#include <cstddef> // size_t
21#include <cstdlib> // for wctomb()
22
23#include <boost/config.hpp> // for BOOST_DEDUCED_TYPENAME
24#if defined(BOOST_NO_STDC_NAMESPACE)
25namespace std{
26    using ::size_t;
27    using ::wctomb;
28} // namespace std
29#endif
30
31#include <boost/pfto.hpp>
32#include <boost/iterator/iterator_adaptor.hpp>
33
34namespace boost {
35namespace archive {
36namespace 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
41template<class Base>    // the input iterator
42class 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 BOOST_DEDUCED_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    char dereference() const {
71        return (const_cast<this_t *>(this))->dereference_impl();
72    }
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        #if (defined(__MINGW32__) && ((__MINGW32_MAJOR_VERSION > 3) || ((__MINGW32_MAJOR_VERSION == 3) && (__MINGW32_MINOR_VERSION >= 8))))
88        m_bend = std::wcrtomb(m_buffer, value, 0);
89        #else
90        m_bend = std::wctomb(m_buffer, value);
91        #endif
92        assert(-1 != m_bend);
93        assert((std::size_t)m_bend <= sizeof(m_buffer));
94        assert(m_bend > 0);
95        m_bnext = 0;
96    }
97
98    void increment(){
99        if(++m_bnext < m_bend)
100            return;
101        m_bend =
102        m_bnext = 0;
103        ++(this->base_reference());
104        m_full = false;
105    }
106
107    // buffer to handle pending characters
108    int m_bend;
109    int m_bnext;
110    char m_buffer[9];
111    bool m_full;
112
113public:
114    // make composible buy using templated constructor
115    template<class T>
116    mb_from_wchar(BOOST_PFTO_WRAPPER(T) start) :
117        super_t(Base(BOOST_MAKE_PFTO_WRAPPER(static_cast<T>(start)))),
118        m_bend(0),
119        m_bnext(0),
120        m_full(false)
121    {}
122    // intel 7.1 doesn't like default copy constructor
123    mb_from_wchar(const mb_from_wchar & rhs) :
124        super_t(rhs.base_reference()),
125        m_bend(rhs.m_bend),
126        m_bnext(rhs.m_bnext),
127        m_full(rhs.m_full)
128    {}
129};
130
131} // namespace iterators
132} // namespace archive
133} // namespace boost
134
135#endif // BOOST_ARCHIVE_ITERATORS_MB_FROM_WCHAR_HPP
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