Getter和setter，指针或引用，以及在c ++中使用的良好语法？ [英] Getter and setter, pointers or references, and good syntax to use in c++?

问题描述

我想知道一个很好的C ++ getters和setters的语法。

  private：
 YourClass * pMember ; 
  

安装程序很容易我猜猜：

  void Member（YourClass * value）{
 this-> pMember = value; //忘记删除等
} 
  

和getter？
应该使用引用还是常量指针？

例如：

  YourClass& Member（）{
 return * this-> pMember; 
} 
  

或

  YourClass * Member（）const {
 return this-> member; 
} 
  

它们之间的区别是什么？

感谢，

Joe

编辑：

对不起，我将编辑我的问题...我知道有关引用和指针，我问的引用和const指针，作为getters，他们之间的区别，在我的代码，如hte future，

所以我想我会使用const指针而不是引用

常量指针不能被删除或设置，对吗？

解决方案

/ p>

• 如果NULL是有效参数或返回值，请使用指针。


• 如果NULL < >
  

因此，如果setter应该可以用NULL调用，使用指针作为参数。否则使用引用。

如果调用包含NULL指针的对象的getter有效，它应该返回一个指针。如果这种情况是非法不变量，则返回值应该是引用。如果成员变量为NULL，getter应该抛出一个异常。

I would like to know a good syntax for C++ getters and setters.

private:
YourClass *pMember;

the setter is easy I guess:

void Member(YourClass *value){
  this->pMember = value; // forget about deleting etc
}

and the getter? should I use references or const pointers?

example:

YourClass &Member(){
   return *this->pMember;
}

or

YourClass *Member() const{
  return this->member;
}

whats the difference between them?

Thanks,

Joe

EDIT:

sorry, I will edit my question... I know about references and pointers, I was asking about references and const pointers, as getters, what would be the difference between them in my code, like in hte future, what shoud I expect to lose if I go a way or another...

so I guess I will use const pointers instead of references

const pointers can't be delete or setted, right?

解决方案

As a general law:

• If NULL is a valid parameter or return value, use pointers.
• If NULL is NOT a valid parameter or return value, use references.

So if the setter should possibly be called with NULL, use a pointer as a parameter. Otherwise use a reference.

If it's valid to call the getter of a object containing a NULL pointer, it should return a pointer. If such a case is an illegal invariant, the return value should be a reference. The getter then should throw a exception, if the member variable is NULL.

这篇关于Getter和setter，指针或引用，以及在c ++中使用的良好语法？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！