C++實現Vector容器的基本功能

　　本文只實現了Vector的默認構造函數、賦值構造函數、賦值函數、析構函數、重置空間大小函數和插入函數，權當起到拋磚引玉的做用，其餘函數功能的實現可在此基礎之上進行拓展。

#include <iostream>  
using namespace std;

template <class T>
class Vector {

public:
    //    構造函數
    Vector(int size=0):theSize(size),theCapacity(size+SPACE_CAPACITY){
        data = new T[theCapacity];
    }

    //    複製構造函數
    Vector(const Vector& other) :theSize(0),theCapacity(0),data(NULL){
        *this=other;
    }
    //    重載賦值函數
    Vector& operator=(Vector& other) {
        //    判斷是否爲自身賦值
        if (this == &other)
            return *this;
        else {
            delete[]data;
            theSize = other.theSize;
            theCapacity = other.theCapacity;
            data = new T[theCapacity];

            for (int i = 0; i < theSize; ++i) {
                data[i] = other.data[i];
            }
            return *this;
        }
    }
    //    析構函數
    ~Vector(void) {
        delete[] data;
    }
    //    從新分配空間大小函數
    void reServe(int newCapacity) {
        if (newCapacity <= theCapacity)
            return;

        T *temp = data;
        data = new T[newCapacity];
        for (int i = 0; i < theSize; ++i)
            data[i] = temp[i];
        delete[] temp;
    }
    //    push_back函數
    void push_back(T val) {
        if (theSize == theCapacity)
            reServe(2 * theCapacity + 1);
        data[theSize++] = val;
    }
private:
    const int SPACE_CAPACITY = 16;
    int theCapacity;
    int theSize;
    T *data;
};