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File Name: mfx_vector.h

\* ****************************************************************************** */

#pragma once
#include "mfxstructures.h"
#include <exception>

namespace MFX 
{
    template <class T>
    class iterator_tmpl 
    {
        template <class U> friend class MFXVector;
        mfxU32 mIndex;
        T* mRecords;
        iterator_tmpl(mfxU32 index , T * records) 
            : mIndex (index)
            , mRecords(records)
        {}
    public:
        iterator_tmpl() 
            : mIndex ()
            , mRecords() 
        {}
        bool  operator ==(const iterator_tmpl<T> & that )const 
        {
            return mIndex == that.mIndex;
        }
        bool  operator !=(const iterator_tmpl<T> & that )const 
        {
            return mIndex != that.mIndex;
        }
        mfxU32 operator - (const iterator_tmpl<T> &that) const 
        {
            return mIndex - that.mIndex;
        }
        iterator_tmpl<T> & operator ++() 
        {
            mIndex++;
            return * this;
        }
        iterator_tmpl<T> & operator ++(int) 
        {
            mIndex++;
            return * this;
        }
        T & operator *() 
        {
            return mRecords[mIndex];
        }
        T * operator ->() 
        {
            return mRecords + mIndex;
        }
    };

    class MFXVectorRangeError : public std::exception
    {
    };

    template <class T>
    class MFXVector  
    {
        T*      mRecords;
        mfxU32  mNrecords;
    public:
        MFXVector()
            : mRecords()
            , mNrecords()
        {}
        MFXVector(const MFXVector & rhs)
            : mRecords()
            , mNrecords()
        {
            insert(end(), rhs.begin(), rhs.end());
        }
        MFXVector & operator = (const MFXVector & rhs)
        {
            if (this != &rhs) 
            {
                clear();
                insert(end(), rhs.begin(), rhs.end());
            }
            return *this;
        }
        virtual ~MFXVector ()
        {
            clear();
        }
        typedef iterator_tmpl<T> iterator;

        iterator begin() const 
        {
            return iterator(0u, mRecords);
        }
        iterator end() const 
        {
            return iterator(mNrecords, mRecords);
        }
        void insert(iterator where, iterator beg_iter, iterator end_iter) 
        {
            mfxU32 elementsToInsert = (end_iter - beg_iter);
            if (!elementsToInsert)
            {
                return;
            }
            if (where.mIndex > mNrecords)
            {
                throw MFXVectorRangeError();
            }

            T *newRecords = new T[mNrecords + elementsToInsert]();
            mfxU32 i = 0;
            
            // save left
            for (; i < where.mIndex; i++) 
            {
                newRecords[i] = mRecords[i];
            }
            // insert
            for (; beg_iter != end_iter; beg_iter++, i++) 
            {
                newRecords[i] = *beg_iter;
            }
    
            //save right
            for (; i < mNrecords + elementsToInsert; i++) 
            {
                newRecords[i] = mRecords[i - elementsToInsert];
            }

            delete [] mRecords;

            mRecords = newRecords;
            mNrecords = i;
        }
        T& operator [] (mfxU32 idx) 
        {
          return mRecords[idx];
        }
        void push_back(const T& obj) 
        {
            T *newRecords = new T[mNrecords + 1]();
            mfxU32 i = 0;
            for (; i <mNrecords; i++) 
            {
                newRecords[i] = mRecords[i];
            }
            newRecords[i] = obj;
            delete [] mRecords;

            mRecords = newRecords;
            mNrecords = i + 1;
            
        }
        void erase (iterator at) 
        {
            if (at.mIndex >= mNrecords)
            {
                throw MFXVectorRangeError();
            }
            mNrecords--; 
            mfxU32 i = at.mIndex;
            for (; i != mNrecords; i++)
            {
                mRecords[i] = mRecords[i+1];
            }
            //destroy last element
            mRecords[i] = T();
        }
        void resize(mfxU32 nSize) 
        {
            T * newRecords = new T[nSize]();
            for (mfxU32 i = 0; i <mNrecords; i++) 
            {
                newRecords[i] = mRecords[i];
            }
            delete [] mRecords;
            mRecords = newRecords;
            mNrecords = nSize;
        }
        mfxU32 size() const 
        {
            return mNrecords;
        }
        void clear() 
        {
            delete [] mRecords;
            mRecords = 0;
            mNrecords = 0;
        }
    };
}