stl里面的vector疑惑.cpp

这是一些c++例程

// STL里面的vector疑惑.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <vector>
#include <iostream>
#include <string>
using namespace std;

class	Tclass
{
  private:
	char *pChar;
  public:
	Tclass()				//默认的构造函数
	{
		pChar = NULL;
	}
	Tclass(char *_pChar,int length);
	void display();
	~Tclass();
};

Tclass::Tclass(char *_pChar,int length)
{
	if ( _pChar == NULL )
	{
		cout << "字符指针不能为空!"<<endl;
		return;									//不应该有返回
	}
	else
	{
		pChar = new char[length+1];
		memset(pChar,0,length+1);
		memcpy(pChar,_pChar,length);
	}
}
	
Tclass::~Tclass()
{
	if (pChar !=NULL)
		delete[] pChar;
};

void Tclass::display()
{
	cout<<pChar<<endl;
}

void main()
{
	vector<Tclass > v_Tclass;
	v_Tclass.clear();
	for (int i =0 ;i<4; i++)
	{
		v_Tclass.push_back(Tclass("test",4));	//"test"占五个字符,可是之分配了四个空间
	}
	
	vector<Tclass>::iterator p;
	
	//dispaly all
	for( p = v_Tclass.begin();p!=v_Tclass.end();p++)
	{
		p->display();
	}
	
}