#pragma once


template <class C, typename T> class TLSHolder
{
public:
	TLSHolder ()
	{
		Create ();
	}

	TLSHolder (T * from)
	{
		Create (from);
	}

	~TLSHolder ()
	{
		Close ();
	}

public:
	static DWORD TLSIndex;

protected:
	static T * Create ()
	{
		void * p = TlsGetValue (TLSIndex);
		if (! p)
		{
			p = new T;
			C::Init ((T *) p);
			BOOL rc = TlsSetValue (TLSIndex, p);
			if (! rc)
			{
#ifdef _DEBUG
				DWORD code = GetLastError ();
#endif
				delete p;
			}
		}

		return Get ();
	}

	static T * Create (T * from)
	{
		void * p = TlsGetValue (TLSIndex);
		if (! p)
		{
			p = from->Clone ();
//			C::Init ((T *) p);
			BOOL rc = TlsSetValue (TLSIndex, p);
			if (! rc)
			{
#ifdef _DEBUG
				DWORD code = GetLastError ();
#endif
				delete p;
			}
		}

		return Get ();
	}

	static void Close ()
	{
		T * p = Get ();
		delete p;
		BOOL rc = TlsSetValue (TLSIndex, 0);
		if (! rc)
		{
#ifdef _DEBUG
			DWORD code = GetLastError ();
			putchar (' ');
#endif
		}
	}

public:
	static T * Get ()
	{
		void * p = TlsGetValue (TLSIndex);
		return (T *) p;
	}
};