c++ - 我应该采取什么步骤来用普通变量替换指针的出现？

Question

参加以下 Seat 类(class):

class Seat
{
    Passenger* passenger;    // I'd like this to be Passenger passenger;
}

如果我去掉星号，我应该如何更新下面的方法？

bool initSeat()
{
    passenger = NULL;             // &passenger = NULL; does not compile as it's not a reference type.
    return passenger == NULL;     // Is there even a need to allocate memory? Maybe have the method blank?
}

和

bool insertSeat(Passenger* p)
{
    bool bsuccess = TRUE;
    if (p != NULL)
    {
        if (passenger == NULL) // replace with &passenger
            passenger = p;     // replacing with &passenger doesn't compile
        else
            bsuccess = FALSE;
    }
    else
        passenger = NULL;   // again, prefixing the & doesn't compile (that'd make it a reference type) so how do I set the pointer to NULL?
    return bsuccess;
}

我可能会感到困惑，因为我缺少一些基本概念。

Answer 1

编辑版本。阅读我的评论:

class Seat
{
    Passenger passenger; 
}

不需要 InitSeat，因为 passenger 将由 Passenger 类的构造函数初始化。

//bool initSeat()
//{
//  passenger = NULL;             
    //return passenger == NULL;    
//}

假设，你只会得到一个指针作为参数:

bool insertSeat(Passenger* p)
{
    bool bsuccess = TRUE;
    if (p != NULL)
    {
        passenger = *p;     // dereference the pointer directly

    }
    else {

        passenger = Passenger(); // Might not be needed, but if needed make sure the assignment operator is properly(operator=) implemented 
    }  
    return bsuccess;
}

基本上，您需要复习一下指针的内容和基本的类设计。