vector容器内部实现机理(源代码和测试代码)

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//Vector.h,个人实现的头文件，源文件引用时用#include "Vector"
#ifndef VECTOR_INCLUDED
#define VECTOR_INCLUDED
template<typename Object>
class Vector
{
public:explicit Vector(int initSize = 0):theSize(initSize),theCapacity(initSize + SPARE_CAPACITY){objects = new Object[theCapacity];}Vector(const Vector &rhs) : objects(NULL){operator =(rhs);}~Vector(){delete [] objects;}const Vector & operator = (const Vector &rhs){if(this != &rhs){delete [] objects;theSize = rhs.size();theCapacity = rhs.theCapacity;objects = new Object[capacity()];for(int k=0;k<size();k++){objects[k] = rhs.objects[k];}}return *this;}void resize(int newSize){if(newSize > theCapacity){reserve(newSize * 2 + 1);}theSize = newSize;}void reserve(int newCapacity){if(newCapacity < theSize){return ;}Object *oldArray = objects;objects = new Object[newCapacity];for(int k=0;k<theSize;k++){objects[k] = oldArray[k];}theCapacity = newCapacity;delete[] oldArray;}Object &operator[] (int index){return objects[index];}const Object &operator[] (int index) const{return objects[index];}bool empty() const{return size() == 0;}int size() const{return theSize;}int capacity() const{return theCapacity;}void push_back(const Object &x){if(theSize == theCapacity){reserve(2 * theCapacity + 1);}objects[theSize++] = x;}void pop_back(){theSize--;}const Object & back() const{return objects[theSize - 1];}typedef Object * iterator;typedef const Object *const_iterator;iterator begin(){return &objects[0];}const_iterator begin() const{return &objects[0];}iterator end(){return &objects[size()];}const_iterator end() const{return &objects[size()];}enum {SPARE_CAPACITY = 16};
private:int theSize;int theCapacity;Object *objects;
};
#endif // VECTOR_INCLUDED

下面为测试代码,使用起来和include<vector>STL一样:

//main.cpp
#include<iostream>
#include<cmath>
#include"Vector"
using namespace std;
int main()
{Vector<int> a;a.push_back(1);a.push_back(100);a.push_back(5);Vector<int>::iterator itr;itr = a.begin();while(itr != a.end()){cout<<*itr++<<endl;}a.pop_back();cout<<"current length is:"<<a.size()<<endl;itr = a.begin();while(itr != a.end()){cout<<*itr++<<endl;}if(!a.empty()){cout<<"is not empty!"<<endl;}else{cout<<"is empty"<<endl;}cout<<"current last data is :"<<*a.end()<<endl;cout<<"current first data is:"<<*a.begin()<<endl;
}

参考文献:<Data Structures and Algorithm Analysis in c++ Third Edition>

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