C++vector Simple Implementation

const int DEFAULT_CAP = 3;template <typename t>class vector {//int capacity;    T* _data;    int _size;        Public://const Vector (): Capacity (Default_cap), _size (0), _data (new t[capacity]) {}; Vector (vector& v): Capacity (V.cap ()), _size (V.size ()), _data (new t[capacity]) {memcpy (_data, V._data, _size*sizeo    F (T));        Vector (vector&& v): Capacity (V.cap ()), _size (V.size ()) {_size = V.getdata ();    V._data = nullptr;    }//deconst Virtual ~vector () {delete [] _data;} Operator vector& operator= (const vector &v) {/* if (this! = &v) {Delete [] _data            ;            _size = V.size ();            Capacity = V.cap ();            _data = new T[capacity];        memcpy (_data, V._data, _size*sizeof (T));        }*/SW (v);    return *this;    } t& operator[] (int i) const{return _data[i];    }//retrun int size () const {return _size;} int cap () const {return Capacity;}    const int GetData () const noexcept {_data;}        function void expand () {if (_size = = capacity) {capacity = capacity<<1;        T *old = _data;        _data = new T[capacity];        memcpy (_data, old, _size*sizeof (T));        delete [] old;        }} void Push_back (T const& temp) {expand ();    _data[_size++] = temp;        } void each () {for (int i = 0; i < _size; ++i) {cout<<_data[i]<<endl;        }} void SW (vector& v) {swap (_size, v._size);        Swap (capacity, v.capcity);    Swap (_data, v._data); }};

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C++vector Simple Implementation