如果要 typedef，搞出來的都是些很惡心的名字，自己看了也生氣，還是不搞好了，就 size_t 和 int 玩到底吧。

把 Array 的接口又改得一塌糊涂了，重新貼一下：

namespace xl
{
    template <typename ValueType>
    class Array
    {
    public:
        Array(size_t nSize = 0);
        Array(size_t nSize, const ValueType &tValue);
        Array(const Array<ValueType> &that);
        ~Array();

    public:
        class Iterator
        {
        public:
            Iterator();
            Iterator(ValueType *pValue);
            Iterator(ValueType *pValue, ValueType *pStart, ValueType *pEof);
            Iterator(const Iterator &that);

        private:
            ValueType *m_pStart;
            ValueType *m_pEof;
            ValueType *m_pCurrent;

        public:
            ValueType &operator * ();
            ValueType *operator -> ();

        public:
            Iterator &operator = (const Iterator &that);
            bool operator == (const Iterator &that) const;
            bool operator != (const Iterator &that) const;

        public:
            Iterator &operator ++ ();
            Iterator operator ++ (int);
            Iterator &operator -- ();
            Iterator operator -- (int);

        public:
            Iterator operator +(int nDistance) const;
            Iterator operator -(int nDistance) const;
            Iterator &operator +=(int nDistance);
            Iterator &operator -=(int nDistance);
        };

        class ReverseIterator : public Iterator
        {
        public:
            ReverseIterator &operator ++ ();
            ReverseIterator operator ++ (int);
            ReverseIterator &operator -- ();
            ReverseIterator operator -- (int);
        };

    public:
        Iterator Begin() const;
        Iterator End() const;
        ReverseIterator RBegin() const;
        ReverseIterator REnd() const;


    public:
        Array<ValueType> &operator=(const Array<ValueType> &that);
        bool operator==(const Array<ValueType> &that) const;
        bool operator!=(const Array<ValueType> &that) const;

    public:
        ValueType &operator[](size_t nIndex);
        const ValueType &operator[](size_t nIndex) const;

    public:
        bool Empty();
        size_t Size() const;
        void SetSize(size_t nSize);

    public:
        void Insert(const Iterator &itBeforeWhich, const ValueType &tValue);
        void Insert(const ReverseIterator &itBeforeWhich, const ValueType &tValue);
        void PushFront(const ValueType &tValue);
        void PushBack(const ValueType &tValue);
        template <typename IteratorType>
        void Insert(const Iterator &itBeforeWhich, const IteratorType &itFirstToInsert, const IteratorType &itAfterLastToInsert);
        template <typename IteratorType>
        void Insert(const ReverseIterator &itBeforeWhich, const IteratorType &itFirstToInsert, const IteratorType &itAfterLastToInsert);
        Iterator Delete(const Iterator &itWhich);
        ReverseIterator Delete(const ReverseIterator &itWhich);
        void PopFront();
        void PopBack();
        Iterator Delete(const Iterator &itFirstToInsert, const Iterator &itAfterLastToDelete);
        Iterator Delete(const ReverseIterator &itFirstToInsert, const ReverseIterator &itAfterLastToDelete);
        void Clear();
        void SetValue(const Iterator &itWhich, const ValueType &tValue);
        void SetValue(const ReverseIterator &itWhich, const ValueType &tValue);
        void SetValue(const Iterator &itFirstToSet, const Iterator &itAfterLastToSet, const ValueType &tValue);
        void SetValue(const ReverseIterator &itFirstToSet, const ReverseIterator &itAfterLastToSet, const ValueType &tValue);

    private:
        ValueType *m_pData;
        size_t m_nSize;
        size_t m_nStart;
        size_t m_nEof;

    private:
        void Release();
        size_t GetWellSize(size_t nSize) const;
        void MoveData(size_t nIndex, size_t nCount, int nDistance);
        void CopyData(size_t nIndex, size_t nCount, ValueType *pNewMem) const;

    };
}

主要的考慮，還是想實現(xiàn)“跨容器的 iterator”（抱歉，我還是覺得這么稱呼挺符合我的預(yù)期的）。只是，在沒有語言層面的 concepts 支持的情況下，如何顯式地讓用戶知道模板參數(shù)要符合哪些條件呢？

在這里再次感謝一下 OwnWaterloo 同學(xué)，上篇評論里的東西我會繼續(xù)慢慢琢磨的。^_^