C++ Templated Bounce

callback.cpp

#include <stdio.h>

class Foo {
public:
	Foo(int val) : val_(val) { }

	void operator()(int v) const
	{
		printf("%p : val = %d\n", this, val_ + v);
	}

private:
	int val_;
};

// Callback bounce function
template<class T, class Ret, class ...Args>
Ret bounce(void *priv, Args... args)
{
	return (*reinterpret_cast<T *>(priv))(args...);
}

// Callback simulator
void call_callback(void (*func)(void *, int), void *priv, int v)
{
	if (func) {
		func(priv, v);
	}
}

// Main Entry
int main()
{
	Foo bar(1327);

	call_callback(&bounce<Foo>, &bar, 10);

	return 0;
}

gistfile1.cpp

// unused method_caller template. example of deducing method pointer traits from arguments.
template<class T, class Ret, class ...Args>
inline Ret method_caller(T *inst, Ret (T::*method)(Args...), Args... args)
{
	return ((*inst).*method)(args...);
}

template<class T, class Ret, class ...Args>
inline Ret method_caller(T *inst, Ret (T::*method)(Args...) const, Args... args)
{
	return ((*inst).*method)(args...);
}