A little tool to show some system informations

#pragma once

#include <list>

using namespace std;


template <class T>
class CDataHistoryT
{
public:
	typedef typename list<T> list_type;
	typedef typename list<T>::size_type size_type;

	CDataHistoryT(): szHistoryLength(400)
	{

	}

	~CDataHistoryT()
	{

	}

	void Push(T d)	// the front is newer, the back is older
	{
		AddData(d);
	}

	int GetHistoryLength(void){return (int)szHistoryLength;}
	int GetSize(void){return (int)lData.size();}
	const list_type & GetDataList(void){return lData;}
	void Clone(list_type & ltTarget){ltTarget.assign(lData.begin(), lData.end());}

	int FillDataToBuffer(T * tBuffer, T * pMin, T * pMax)
	{
		size_type sz = 0;
		list_type::const_iterator i = lData.begin();
		if(i != lData.end())
		{
			if(pMin)
				*pMin = *i;
			if(pMax)
				*pMax = *i;
		}
		for(i = lData.begin(); i != lData.end(); i++)
		{
			tBuffer[sz++] = *i;
			if(pMin)
			{
				if(*pMin > *i)
					*pMin = *i;
			}
			if(pMax)
			{
				if(*pMax < *i)
					*pMax = *i;
			}
		}
		return (int)sz;
	}

	int FillDataToBuffer(T * tBuffer, T * pMin, T * pMax, int nBufferSize)
	{
		if(nBufferSize < 1)
			return 0;
		size_type sz = 0;
		list_type::const_iterator i = lData.begin();
		if(i != lData.end())
		{
			if(pMin)
				*pMin = *i;
			if(pMax)
				*pMax = *i;
		}
		for(i = lData.begin(); i != lData.end(); i++)
		{
			tBuffer[sz++] = *i;
			if(pMin)
			{
				if(*pMin > *i)
					*pMin = *i;
			}
			if(pMax)
			{
				if(*pMax < *i)
					*pMax = *i;
			}
			if((int)sz >= nBufferSize)
				break;
		}
		return (int)sz;
	}

	void SetHistoryLength(int n)
	{
		size_type szNew = (size_type)n;

		if(szNew <= 0)
			return;
		szHistoryLength = szNew;
		if(lData.size() > szHistoryLength)
		{
			size_type sz = lData.size() - szHistoryLength;
			for(size_type i = 0; i < sz; i++)
				lData.pop_back();
		}
	}

	void Clear(void)
	{
		lData.clear();
	}
protected:
	list_type lData;
	size_type szHistoryLength;

	void AddData(T d)
	{
		lData.push_front(d);
		if(lData.size() > szHistoryLength)
		{
			size_type sz = lData.size() - szHistoryLength;
			for(size_type i = 0; i < sz; i++)
				lData.pop_back();
		}
	}
};


typedef CDataHistoryT<DWORD> CDWDataHistory;
typedef CDataHistoryT<double> CDBDataHistory;