Leaked source code of windows server 2003
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//
// Systrack - System resource tracking
// Copyright (c) Microsoft Corporation, 1997
//
//
// header: history.hxx
// author: silviuc
// created: Wed Nov 11 12:17:11 1998
//
#ifndef _HISTORY_HXX_INCLUDED_
#define _HISTORY_HXX_INCLUDED_
#include "assert.hxx"
template<class T, unsigned Sz>
class History
{
private:
bool _Empty;
unsigned _Size;
unsigned _Index;
T _Data [Sz];
public:
History () {
_Empty = true;
_Size = Sz;
_Index = 0;
ZeroMemory (_Data, sizeof _Data);
}
const T& Last () const {
assert_ (_Size != 0);
return _Data [(_Index + _Size - 1) % _Size];
}
const T& First () const {
return _Data [_Index];
}
void Add (const T& Value) {
if (_Empty == true) {
for (unsigned I = 0; I < _Size; I++)
_Data[I] = Value;
_Empty = false;
}
_Data[_Index] = Value;
_Index = (_Index + 1) % _Size;
}
void Reset (const T& Value) {
for (unsigned Index = 0; Index < _Size; Index++) {
_Data[Index] = Value;
}
}
bool Delta (const T& DeltaValue) const {
return (First() < Last()) && ((Last() - First()) > DeltaValue);
}
};
// ...
#endif // #ifndef _HISTORY_HXX_INCLUDED_
//
// end of header: history.hxx
//