Thread Local Storage - The C++ Way

#ifndef TLS_H_
#define TLS_H_

# pragma warning(disable:4284) // odd return type for operator->

#ifdef TLS_ALLOC
#	define basic_default basic_tls_alloc
#else
#	define basic_default basic_tls_declspec
#endif

class basic_tls_declspec {
public:

	basic_tls_declspec(void (*pvpv)(void*));
	static void thread_term(void);

protected:

	void set(void* pv);     
	void* get() const;

private:

	const unsigned id;

	static void** thread_init(void);
	void (*pdtor)(void*);

	basic_tls_declspec* const prev;
	static basic_tls_declspec*  last;
	static unsigned idmax;
};

class basic_tls_alloc {
public:

	basic_tls_alloc(void (*pvpv)(void*));
	static void thread_term(void);

protected:

	void set(void* pv);     
	void* get() const;

private:

	const unsigned id;

	static void** thread_init(void);
	void (*pdtor)(void*);

	basic_tls_alloc* const prev;
	static basic_tls_alloc*  last;
	static unsigned idmax;
};

template<class T, class B = basic_default> class tls_ptr : private B {
public:

	tls_ptr(void (*cleanup)(void*) = &dtor) : B(cleanup) {}
    inline T* get() const {	return static_cast<T*>(B::get()); }
    inline T* operator->() const { return get(); }
    inline T& operator*() const { return *get(); }
	T* release() { T* temp = get(); if(temp) B::set(0); return temp; }
    void reset(T* p=0)
    {
        T* cur = get();
        if (cur == p) return;
		B::set(p);
        if (cur) dtor(cur);
    }

private:
	static void dtor(void* p) { delete static_cast<T*>(p);	}
};

// autolink section
#ifndef TLS_BUILD_LIB

#if (_MSC_VER == 1200)
#	define TOOLSET "vc6"
#elif (_MSC_VER == 1300)
#	define TOOLSET "vc7"
#elif (_MSC_VER >= 1310)
#	define TOOLSET "vc71"
#endif

#ifdef _DEBUG
#	ifdef _DLL
#		define RTOPT "-d"
#	else
#		define RTOPT "-sd"
#	endif
#else
#	ifdef _DLL
#		define RTOPT
#	else
#		define RTOPT "-s"
#	endif
#endif

#pragma comment(lib, "libtls" "_" TOOLSET "-mt" RTOPT ".lib")
#ifdef _DEBUG
#	pragma message("Linking with: " "libtls" "_" TOOLSET "-mt" RTOPT ".lib")
#endif
#endif

#undef TOOLSET
#undef RTOPT

#endif