怎么实现构造函数与析构函数,面试题

[huangzhongzhi]

//汽车仓库
class Factory
{
car** pCarArray;
int m_nNum;
Factory(int v_nNum);
~Factory();
};

[roadblossom]

up

[hhyttppd]

car** pCarArray; ?

[waizqfor]

[Quote=引用楼主 huangzhongzhi 的帖子:]
//汽车仓库
class Factory
{
car** pCarArray;
int m_nNum;
Factory(int v_nNum);
~Factory();
};
[/Quote]
构造函数与析构函数的实现？
Factory(int v_nNum){.............}
~Factory(){..............}
想实现什么功能 直接写不就可以了嘛

[yndfcd]

Factory(int v_nNum)
 :m_nNum(v_nNum)
 {
  pCarArray = new car*[v_nNum]
 } 

[wuyu637]

class Factory
{ public:
car** pCarArray;
int m_nNum;
Factory(int v_nNum)
{
m_nNum = v_nNum;

pCarArray = new car*;
*pCarArray = new car[v_nNum];
};
~Factory()
{

if(*pCarArray != NULL)
{
//pCarArray;
delete [] *pCarArray;
delete pCarArray;
}
m_nNum = 0;
};
};


int _tmain(int argc, _TCHAR* argv[])
{
Factory *f = new Factory(10);

delete f;



return 0;
}

[cattycat]

从含义判断构造函数应该定义一个数组。
Factory(int v_nNum)
{
m_nNum=v_nNum;
pCarArray=new car[m_nNum];
}
~Factory()
{
delete pCarArray;
}

[cppfaq]

个人感觉他既然用car**而非car*，那么可能主要使用场景是从外部传入carArray
Factory(int v_nNum, char** v_carArray):m_nNum(v_nNum), pCarArray(v_carArray){};
当然了，~Factory的原则是谁创建谁小会