类原型 [英] Class prototyping

问题描述

我在类a中放置了类b的几个实例，但这会导致错误，因为类a不知道类b是什么。

I have put several instances of class b in class a but this causes an error as class a does not know what class b is.

现在，我知道我可以通过将文件b a c写入文件来解决此问题，但是这不仅影响了可访问性，而且使我感到烦恼。我知道我可以原型化我的函数，所以我没有这个问题，但是找不到关于如何原型化类的材料。

Now I know I can solve this problem by writing my file b a c but this messes up the reachability as well as annoys me. I know I can prototype my functions so I do not have this problem but have been able to find no material on how to prototype a class.

没有人有c ++中的类原型示例。

does anyone have an example of class prototyping in c++.

因为似乎有些混乱，让我向您展示我想要的东西

as there seems to be some confusion let me show you what i want

class A
{
public:

B foo[5];

};

class B
{
public:
int foo;
char bar;
}

但这不起作用，因为A无法看到B，所以我需要放点东西在他们两个人之前，如果这是一个函数，我会把A（）;然后实施。

but this does not work as A cannot see B so i need to put something before them both, if it was a function i would put A(); then implement it later. how can i do this with a class.

推荐答案

您可以声明所有类，然后以任何顺序定义它们，就像这样：

You can declare all your classes and then define them in any order, like so:

// Declare my classes
class A;
class B;
class C;

// Define my classes (any order will do)
class A { ... };
class B { ... };
class C { ... };

这篇关于类原型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！