ClockDomain.h

#include <iostream>

#include <cmath>
#include <stdint.h>

namespace ClockDomain
{

    template <typename ReturnT>
    class CallbackBase
    {
        public:
        virtual ReturnT operator()() = 0;
    };


    template <typename ConsumerT, typename ReturnT>
    class Callback: public CallbackBase<ReturnT>
    {
        private:
        typedef ReturnT (ConsumerT::*PtrMember)();

        public:
        Callback(ConsumerT* const object, PtrMember member) : object(object), member(member) {}

        Callback(const Callback<ConsumerT,ReturnT> &e) : object(e.object), member(e.member) {}

        ReturnT operator()()
        {
            return (const_cast<ConsumerT*>(object)->*member)();
        }

        private:
        ConsumerT* const object;
        const PtrMember  member;
    };

    typedef CallbackBase <void> ClockUpdateCB;


	class ClockDomainCrosser
	{
		public:
		ClockUpdateCB *callback;
		uint64_t clock1, clock2;
		uint64_t counter1, counter2;
		ClockDomainCrosser(ClockUpdateCB *_callback);
		ClockDomainCrosser(uint64_t _clock1, uint64_t _clock2, ClockUpdateCB *_callback);
		ClockDomainCrosser(double ratio, ClockUpdateCB *_callback);
		void update();
	};


	class TestObj
	{
		public:
		TestObj() {}
		void cb();
		int test();
	};
}