c - C中的静态局部变量是什么意思？

Question

 BOOL foo(void){

    static BOOL displayed = FALSE;
    static BOOL initialized = FALSE;

    if (displayed)
        return FALSE;

    //more code 

    displayed = TRUE;
    return FALSE;
}

C 中静态局部变量的含义是什么？

如果第二次调用此方法，显示的不会重新初始化为FALSE吗？

Answer 1

静态局部变量只在程序启动前初始化一次。然后，它们的值在调用之间保持不变。

来自标准，第 6.2.4/3 节对象的存储持续时间:

An object whose identifier is declared without the storage-class specifier _Thread_local, and either with external or internal linkage or with the storage-class specifier static, has static storage duration. Its lifetime is the entire execution of the program and its stored value is initialized only once, prior to program startup.