KSG-Framework/Iterator.h

#pragma once

/**
 * Iterator interface
 * \tparam T type of the value that is iterated
 * \tparam I type of the iterator subclass
 */
template<typename T, typename I> class Iterator
{
public:
    virtual ~Iterator()
    {
        static_assert(std::is_base_of<Iterator, I>::value,
            "Type Argument I must be an implementation of Iterator");
    }

    virtual bool hasNext()
    {
        return (bool)next();
    }

    virtual I next() = 0;

    virtual operator bool() = 0;

    virtual I& operator++() //! prefix
    {
        *(I*)this = next();
        return *(I*)this;
    }

    virtual I operator++(int) //! postfix
    {
        I tmp(*(I*)this);
        operator++();
        return tmp;
    }

    virtual T val() = 0;

    virtual void set(T val) = 0;

    virtual void remove() = 0;

    operator T()
    {
        return val();
    }

    virtual T operator->()
    {
        return val();
    }

    virtual T operator*()
    {
        return val();
    }
};