RandIt.h

#pragma once


#include <libutl/BidIt.h>


UTL_NS_BEGIN;



class RandIt : public BidIt
{
    UTL_CLASS_DECL_ABC(RandIt, BidIt);
    UTL_CLASS_DEFID;

public:
    virtual Object* get() const = 0;

    virtual Object* get(size_t offset) const = 0;

    virtual size_t offset() const = 0;

    virtual void seek(size_t offset) = 0;

    virtual void set(const Object* object) = 0;

    virtual void set(size_t offset, const Object* object) = 0;

    virtual size_t size() const = 0;

    virtual size_t
    subtract(const RandIt& it) const
    {
        return (offset() - it.offset());
    }

    size_t operator-(const RandIt& it) const
    {
        return subtract(it);
    }

    Object* operator[](size_t offset) const
    {
        return get(offset);
    }

public:
    // for STL
    typedef Object* value_type;
    typedef Object*& reference;
    typedef Object** pointer;
    typedef std::random_access_iterator_tag iterator_category;
    typedef std::ptrdiff_t difference_type;
};


UTL_NS_END;


#include <libutl/TRandIt.h>