Thunking in Win32: Simplifying Callbacks to Non-static Member Functions

#pragma once

// Boost Headers
#include <boost/thread/mutex.hpp>

namespace indev
{
	class Thunk32Base
	{
	protected:
		Thunk32Base();
		~Thunk32Base();

		struct Bytecode
		{
	#pragma pack(push, 1)
			unsigned short stub1;      // lea ecx, 
			unsigned long  nThisPtr;   // this
			unsigned char  stub2;      // mov eax,
			unsigned long  nJumpProc;  // pointer to destination function
			unsigned short stub3;      // jmp eax
	#pragma pack(pop)
			Bytecode() :
				stub1	  (0x0D8D),
				nThisPtr  (0),
				stub2	  (0xB8),
				nJumpProc (0),
				stub3	  (0xE0FF)
			{}
		} *bytecode;

		static void* volatile bytecodeHeap;
		static boost::mutex heapMutex;

	private:
		// Thunks will not be copyable
		Thunk32Base(const Thunk32Base&); // not implemented
		const Thunk32Base& operator=(const Thunk32Base&); // not implemented

		static void __cdecl cleanupHeap();
	};
}