add Vector class(unfinished

thu_dsa/chp2/Vector.cpp

@@ -0,0 +1,55 @@
+#include "Vector.h"
+
+//protected methods
+template <typename T>
+void Vector::copyfrom(T* const A, int lo, int hi){
+	int ix = 0;
+	while (lo != hi) _elem[ix++] = A[lo++];
+}
+
+template <typename T>
+void Vector::copyfrom(Vector<T>& const V, int lo, int hi){
+	copyfrom(V._elem, lo, hi);
+}
+
+//constructors
+template<typename T>
+Vector::Vector() {
+	_capacity = DEFAULT_CAPACITY;
+	_size = 0;
+	_elem = new T[_capacity];
+}
+
+template<typename T>
+Vector::Vector(int capacity) {
+	_capacity = capacity;
+	_size = 0;
+	_elem = new T[_capacity];
+}
+
+template<typename T>
+Vector::Vector(T* const A, int lo, int hi){
+	_capacity = MAX(DEFAULT_CAPACITY, (hi - lo) >> 1);
+	_size = hi - lo;
+	copyfrom(A, lo, hi);
+}
+
+template<typename T>
+Vector(Vectort<T>& const V){
+	_size = V.getSize();
+	_capacity = _size >> 1;
+	copyfrom(V._elem, 0, _size);
+}
+
+template<typename T>
+Vector::Vector(Vector<T>& const V, int lo, int hi){
+	_capacity = MAX(DEFAULT_CAPACITY, (hi - lo) >> 1);
+	_size = hi - lo;
+	copyfrom(V, lo, hi);
+}
+
+//read-only interfaces
+template<typename T>
+Vector::print(){
+	
+}