C++构造函数并不将指针变量初始化为NULL,应该引起足够的注意
// mysqlTest.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include <MRDBIO.h>
#include <DBIO.h>
#include <iostream>
#include <string>
#include <cctype>
#include <cassert>
using namespace std;
class Person
{
public:
Person(string name){this->m_name = name;}
void Display(){cout << "Person Display" << m_name << endl;}
private:
string m_name;
};
class Test
{
public:
Test();
void DisplayIn();
private:
Person *person;
};
Test::Test()
{
if (NULL == person) //注意这行,person初始化的时候并不会为NULL
{
person = new Person("GANQUANFU");//故这语句根本就不会执行,这样的写法存在隐患
}
}
void Test::DisplayIn()
{
person->Display();
}
int _tmain(int argc, _TCHAR* argv[])
{
Test test;
test.DisplayIn();
int wait;
cin >> wait;
return 0;
}