lib/gcc-lib/i686-pc-msys/2.95.3-1/include/g++-3/std/gslice.h

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  32 #ifndef __GSLICE__
  33 #define __GSLICE__
  34
  35 extern "C++" {
  36
  37 struct _Indexer {
  38     size_t _M_count;
  39     size_t _M_start;
  40     valarray<size_t> _M_size;
  41     valarray<size_t> _M_stride;
  42     valarray<size_t> _M_index;
  43     _Indexer(size_t, const valarray<size_t>&, const valarray<size_t>&);
  44     void _M_increment_use() { ++_M_count; }
  45     size_t _M_decrement_use() { return --_M_count; }
  46 };
  47
  48
  49 class gslice
  50 {
  51 public:
  52     gslice ();
  53     gslice (size_t, const valarray<size_t>&, const valarray<size_t>&);
  54     gslice(const gslice&);
  55     ~gslice();
  56
  57     gslice& operator= (const gslice&);
  58     size_t           start () const;
  59     valarray<size_t> size () const;
  60     valarray<size_t> stride () const;
  61
  62 private:
  63     _Indexer* _M_index;
  64
  65     template<typename _Tp> friend class valarray;
  66 };
  67
  68 inline size_t
  69 gslice::start () const
  70 { return _M_index ? _M_index->_M_start : 0; }
  71
  72 inline valarray<size_t>
  73 gslice::size () const
  74 { return _M_index ? _M_index->_M_size : valarray<size_t>(); }
  75
  76 inline valarray<size_t>
  77 gslice::stride () const
  78 { return _M_index ? _M_index->_M_stride : valarray<size_t>(); }
  79
  80 inline gslice::gslice () : _M_index(0) {}
  81
  82 inline
  83 gslice::gslice(size_t __o, const valarray<size_t>& __l,
  84                const valarray<size_t>& __s)
  85         : _M_index(new _Indexer(__o, __l, __s)) {}
  86
  87 inline
  88 gslice::gslice(const gslice& __g) : _M_index(__g._M_index)
  89 { if (_M_index) _M_index->_M_increment_use(); }
  90
  91 inline
  92 gslice::~gslice()
  93 { if (_M_index && _M_index->_M_decrement_use() == 0) delete _M_index; }
  94
  95 inline gslice&
  96 gslice::operator= (const gslice& __g)
  97 {
  98     if (__g._M_index) __g._M_index->_M_increment_use();
  99     if (_M_index && _M_index->_M_decrement_use() == 0) delete _M_index;
 100     _M_index = __g._M_index;
 101     return *this;
 102 }
 103
 104
 105 }
 106
 107 #endif
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