方法调用中的静态变量 [英] static variable in method call

问题描述

如果在方法中创建本地静态变量，那么每个实例都初始化一次，或者每个程序初始化一次。

If you create a local static variable inside a method, is that initialised once per instance, or once per program?

这在C ++和Objective-C ？

Does this differ between C++ and Objective-C?

推荐答案

如果在方法中创建本地静态变量， ，或每个节目一次？

If you create a local static variable inside a method, is that initialised once per instance, or once per program?

即使是每个节目一次，每个节目一次

Once per program.

它是在非静态类成员函数中，它不与任何类实例相关联;在整个程序中只有一个变量实例，只初始化一次。

Even if it is in a non-static class member function, it is not associated with any class instance; there will only be one instance of the variable in the whole program, initialised just once.

C ++和Objective-C之间是否有区别？

Does this differ between C++ and Objective-C?

在C ++中，它在第一次调用函数时初始化。在C（和Objective-C）中，它在程序启动之前被初始化。在实践中，这没有什么区别，因为初始化在C中不会有任何副作用。

In C++, it is initialised the first time the function is called. In C (and Objective-C), it is initialised prior to program startup. In practice, this doesn't make a difference, since the initialisation can't have any side effects in C.

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