WindowsThreadPool.h

#ifndef PFACES_AGENET_WIN_THREAD_POOL_
#define PFACES_AGENET_WIN_THREAD_POOL_

#include <basetsd.h>
#include <windef.h>
#include <winnt.h>
#include <memory>

class WindowsThreadPool
{
public:

	template <typename T>
	static void QueueUserWorkItem(void (T::* function)(void),
		T* object, ULONG flags = WT_EXECUTELONGFUNCTION)
	{
		typedef std::pair<void (T::*)(), T*> CallbackType;
		std::auto_ptr<CallbackType> p(new CallbackType(function, object));

		if (::QueueUserWorkItem(ThreadProc<T>, p.get(), flags))
		{
			// The ThreadProc now has the responsibility of deleting the pair.
			p.release();
		}
		else
		{
			throw GetLastError();
		}
	}

private:

	template <typename T>
	static DWORD WINAPI ThreadProc(PVOID context)
	{
		typedef std::pair<void (T::*)(), T*> CallbackType;

		std::auto_ptr<CallbackType> p(static_cast<CallbackType*>(context));

		(p->second->*p->first)();
		return 0;
	}
};

#endif