1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
|
//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
// $NoKeywords: $
//
//=============================================================================//
#ifndef _BLOCKARRAY_H
#define _BLOCKARRAY_H
#include "tier0/dbg.h"
// memdbgon must be the last include file in a .cpp file!!!
#include <tier0/memdbgon.h>
template <class T, int nBlockSize, int nMaxBlocks>
class BlockArray
{
public:
BlockArray()
{
nCount = nBlocks = 0;
}
~BlockArray()
{
GetBlocks(0);
}
T& operator[] (int iIndex);
void SetCount(int nObjects);
int GetCount() { return nCount; }
private:
T * Blocks[nMaxBlocks+1];
short nCount;
short nBlocks;
void GetBlocks(int nNewBlocks);
};
template <class T, int nBlockSize, int nMaxBlocks>
void BlockArray<T,nBlockSize,nMaxBlocks>::
GetBlocks(int nNewBlocks)
{
for(int i = nBlocks; i < nNewBlocks; i++)
{
Blocks[i] = new T[nBlockSize];
}
for(int i = nNewBlocks; i < nBlocks; i++)
{
delete[] Blocks[i];
}
nBlocks = nNewBlocks;
}
template <class T, int nBlockSize, int nMaxBlocks>
void BlockArray<T,nBlockSize,nMaxBlocks>::
SetCount(int nObjects)
{
if(nObjects == nCount)
return;
// find the number of blocks required by nObjects, checking for
// integer rounding error
int nNewBlocks = (nObjects / nBlockSize);
if ((nNewBlocks * nBlockSize) < nObjects)
{
nNewBlocks++;
}
if(nNewBlocks != nBlocks)
{
// Make sure we don't get an overrun.
if ( nNewBlocks > ARRAYSIZE( Blocks ) )
{
Error( "BlockArray< ?, %d, %d > - too many blocks needed.", nBlockSize, nMaxBlocks );
}
GetBlocks(nNewBlocks);
}
nCount = nObjects;
}
template <class T, int nBlockSize, int nMaxBlocks>
T& BlockArray<T,nBlockSize,nMaxBlocks>::operator[] (int iIndex)
{
// Cast to unsigned so that this check will reject negative values as
// well as overly large values.
if((unsigned)iIndex >= (unsigned)nCount)
{
Error( "BlockArray< %d, %d > - invalid block index.", iIndex, nCount );
SetCount(iIndex+1);
}
return Blocks[iIndex / nBlockSize][iIndex % nBlockSize];
}
#include <tier0/memdbgoff.h>
#endif // _BLOCKARRAY_H
|