与C ++ OOP混淆了 [英] Got confused with C++ OOP

问题描述

Buckys C ++编程教程 - 42 - Arrow会员选择运营商 - YouTube [ ^ ]



所以你看到这里他有3个文件：main.cpp，Sally.h和Sally.cpp，他在Sally.cpp文件中定义了一个void函数，语法为void Sally :: printCrap（）。我很困惑，为什么他要把类的名称用于在类外定义一个函数？有人可以解释一下吗。我真的很感激！



我的尝试：



对于小而不详细的问题很抱歉，但我限于200个字符：XI希望你理解我的问题，并希望你能解释我。





谢谢！

Buckys C++ Programming Tutorials - 42 - Arrow Member Selection Operator - YouTube[^]

So you see here he has 3 files: main.cpp, Sally.h and Sally.cpp and he is defining a void function in the Sally.cpp file with syntax void Sally::printCrap(). I got confused in that why he is putting the name of the class for defining a function in outside the class ? Can someone explain me that. I will be really thanksful!

What I have tried:

Sorry for the small and not detailed question but I am limited to 200 characters :X I hope you understood my question and hope you will explain me that.


Thanks!

推荐答案

Sally :: printCrap（）是因为printCrap是在Sally类之外定义的。如果它是在类内部定义的（内联），它就不必拥有Sally ::



如果你没有'Sally ::'，那么编译器就不会知道函数属于哪个类。

The Sally::printCrap() is because printCrap is defined outside the Class Sally. If it were defined inside the class (inline) it would not have to have Sally::

If you dont have 'Sally::', then the compiler would not know which class the function belonged to.

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