reactos/tools/rbuild_helper/stringz_iterator.h

   1 /*
   2         Copyright (c) 2009 KJK::Hyperion
   3
   4         Permission is hereby granted, free of charge, to any person obtaining a
   5         copy of this software and associated documentation files (the "Software"),
   6         to deal in the Software without restriction, including without limitation
   7         the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8         and/or sell copies of the Software, and to permit persons to whom the
   9         Software is furnished to do so, subject to the following conditions:
  10
  11         The above copyright notice and this permission notice shall be included in
  12         all copies or substantial portions of the Software.
  13
  14         THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15         IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16         FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  17         AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18         LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  19         FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  20         DEALINGS IN THE SOFTWARE.
  21 */
  22
  23 #ifndef KJK_STRINGZ_ITERATOR_H_
  24 #define KJK_STRINGZ_ITERATOR_H_
  25
  26 #include <cstddef>
  27 #include <iterator>
  28
  29 namespace kjk
  30 {
  31         template<class Type, class Traits = std::char_traits<Type> > class stringz_iterator;
  32
  33         template<class CharT> stringz_iterator<CharT> stringz_begin(const CharT *);
  34         template<class Traits, class CharT> stringz_iterator<CharT, Traits> stringz_begin(const CharT *);
  35
  36         template<class CharT> stringz_iterator<CharT> stringz_end(const CharT *);
  37         template<class Traits, class CharT> stringz_iterator<CharT, Traits> stringz_end(const CharT *);
  38
  39         template<class Type, class Traits>
  40         class stringz_iterator: public std::iterator<std::forward_iterator_tag, Type, std::ptrdiff_t, const Type *, const Type&>
  41         {
  42         private:
  43                 template<class CharT2> friend stringz_iterator<CharT2> stringz_begin(const CharT2 *);
  44                 template<class Traits2, class CharT2> friend stringz_iterator<CharT2, Traits2> stringz_begin(const CharT2 *);
  45
  46                 template<class CharT2> friend stringz_iterator<CharT2> stringz_end(const CharT2 *);
  47                 template<class Traits2, class CharT2> friend stringz_iterator<CharT2, Traits2> stringz_end(const CharT2 *);
  48
  49                 // FIXME: this sucks because GCC sucks
  50                 typedef const Type * pointer_;
  51                 typedef const Type& reference_;
  52
  53                 pointer_ m_p;
  54
  55                 static pointer_ set_pointer(pointer_ p)
  56                 {
  57                         if(p != 0 && Traits::eq_int_type(Traits::to_int_type(*p), 0))
  58                                 return 0;
  59                         else
  60                                 return p;
  61                 }
  62
  63                 explicit stringz_iterator(pointer_ p): m_p(set_pointer(p)) { }
  64
  65         public:
  66                 stringz_iterator(): m_p() {}
  67                 stringz_iterator(const stringz_iterator& That): m_p(set_pointer(That.m_p)) { }
  68
  69                 const stringz_iterator& operator=(const stringz_iterator& That)
  70                 {
  71                         m_p = set_pointer(That.m_p);
  72                         return *this;
  73                 }
  74
  75                 bool operator==(const stringz_iterator& That) const
  76                 {
  77                         return m_p == That.m_p;
  78                 }
  79
  80                 bool operator!=(const stringz_iterator& That) const
  81                 {
  82                         return m_p != That.m_p;
  83                 }
  84
  85                 reference_ operator*() const { return *m_p; }
  86
  87                 const stringz_iterator& operator++()
  88                 {
  89                         m_p = set_pointer(m_p + 1);
  90                         return *this;
  91                 }
  92
  93                 stringz_iterator operator++(int)
  94                 {
  95                         stringz_iterator oldValue(*this);
  96                         ++ (*this);
  97                         return oldValue;
  98                 }
  99
 100                 pointer_ base() const { return m_p; }
 101         };
 102
 103         template<class CharT>
 104         stringz_iterator<CharT> stringz_begin(const CharT * p)
 105         {
 106                 return stringz_iterator<CharT>(p);
 107         }
 108
 109         template<class Traits, class CharT>
 110         stringz_iterator<CharT> stringz_begin(const CharT * p)
 111         {
 112                 return stringz_iterator<CharT, Traits>(p);
 113         }
 114
 115         template<class CharT>
 116         stringz_iterator<CharT> stringz_end(const CharT *)
 117         {
 118                 return stringz_iterator<CharT>(0);
 119         }
 120
 121         template<class Traits, class CharT>
 122         stringz_iterator<CharT> stringz_end(const CharT *)
 123         {
 124                 return stringz_iterator<CharT, Traits>(0);
 125         }
 126 }
 127
 128 #endif
 129
 130 // EOF