C ++中静态成员函数的用途？ [英] Purpose of a static member function in C++?

问题描述

如果每个成员函数每个类只包含一次（要由所有实例共享），那么声明成员函数static的目的究竟是什么？它是一个被声明为const的函数，因为它修改了特定类型的数据（在这种情况下是静态数据成员）？

If each member function is only contained once per class (to be shared by all instances) what exactly is the purpose of declaring a member function static? Is it like a function being declared const, in that it modifies a particular type of data (in this case, static data members)?

推荐答案

正常的成员函数需要一个类实例来运行。静态方法可以直接调用而无需先创建类的实例。

Normal member functions require a class instance to run. Static methods can be called directly without first creating an instance of the class.

正常方法：

MyClass myClass;
myClass.NormalMethod();

静态方法：

MyClass::StaticMethod();

所以正常的方法对于使用类数据的函数是完美的。如果一个方法不需要使用类数据，那么它将是一个可能被静态的候选对象。

So normal methods are perfect for functions that work with the class data. If a method doesn't need to work with the class data, then it would be a candidate for possibly being made static.

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