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