Mercurial > vba-linux

     1 // Common/Buffer.h

     2 

     3 #ifndef __COMMON_BUFFER_H

     4 #define __COMMON_BUFFER_H

     5 

     6 #include "Defs.h"

     7 

     8 template <class T> class CBuffer

     9 {

    10 protected:

    11   size_t _capacity;

    12   T *_items;

    13 public:

    14   void Free()

    15   {

    16     delete []_items;

    17     _items = 0;

    18     _capacity = 0;

    19   }

    20   CBuffer(): _capacity(0), _items(0) {};

    21   CBuffer(const CBuffer &buffer): _capacity(0), _items(0) { *this = buffer; }

    22   CBuffer(size_t size): _items(0),  _capacity(0) {  SetCapacity(size); }

    23   virtual ~CBuffer() { delete []_items; }

    24   operator T *() { return _items; };

    25   operator const T *() const { return _items; };

    26   size_t GetCapacity() const { return  _capacity; }

    27   void SetCapacity(size_t newCapacity)

    28   {

    29     if (newCapacity == _capacity)

    30       return;

    31     T *newBuffer;

    32     if (newCapacity > 0)

    33     {

    34       newBuffer = new T[newCapacity];

    35       if (_capacity > 0)

    36         memmove(newBuffer, _items, MyMin(_capacity, newCapacity) * sizeof(T));

    37     }

    38     else

    39       newBuffer = 0;

    40     delete []_items;

    41     _items = newBuffer;

    42     _capacity = newCapacity;

    43   }

    44   CBuffer& operator=(const CBuffer &buffer)

    45   {

    46     Free();

    47     if (buffer._capacity > 0)

    48     {

    49       SetCapacity(buffer._capacity);

    50       memmove(_items, buffer._items, buffer._capacity * sizeof(T));

    51     }

    52     return *this;

    53   }

    54 };

    55 

    56 template <class T>

    57 bool operator==(const CBuffer<T>& b1, const CBuffer<T>& b2)

    58 {

    59   if (b1.GetCapacity() != b2.GetCapacity())

    60     return false;

    61   for (size_t i = 0; i < b1.GetCapacity(); i++)

    62     if (b1[i] != b2[i])

    63       return false;

    64   return true;

    65 }

    66 

    67 template <class T>

    68 bool operator!=(const CBuffer<T>& b1, const CBuffer<T>& b2)

    69 {

    70   return !(b1 == b2);

    71 }

    72 

    73 typedef CBuffer<char> CCharBuffer;

    74 typedef CBuffer<wchar_t> CWCharBuffer;

    75 typedef CBuffer<unsigned char> CByteBuffer;

    76 

    77 #endif
author	Robert McIntyre <rlm@mit.edu>
date	Sat, 03 Mar 2012 10:31:27 -0600
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