在类中初始化静态struct tm [英] Initializing static struct tm in a class

问题描述

我想使用tm结构作为类中的静态变量。花了一整天的时间阅读和尝试，但它仍然不能工作:(如果有人可以指出我做错了什么感谢。

I would like to use the tm struct as a static variable in a class. Spent a whole day reading and trying but it still can't work :( Would appreciate if someone could point out what I was doing wrong

在我的班，我已声明为：

In my class, under Public, i have declared it as:

static struct tm *dataTime;

在main.cpp中，我试图定义和初始化它与系统时间临时测试（在运行时输入的实际时间）

In the main.cpp, I have tried to define and initialize it with system time temporarily to test out (actual time to be entered at runtime)

time_t rawTime;
time ( &rawTime );
tm Indice::dataTime = localtime(&rawTime);

但似乎我不能使用time（）外部函数。

but seems like i can't use time() outside functions.

main.cpp：28：error：expected
构造函数，析构函数或类型
$ b

main.cpp:28: error: expected constructor, destructor, or type conversion before ‘(’ token

如何初始化类的静态tm中的值？

How do I initialize values in a static tm of a class?

推荐答案

你可以将上面的函数包装起来：

You can wrap the above in a function:

tm initTm() {
    time_t rawTime;
    ::time(&rawTime);
    return *::localtime(&rawTime);
}

tm Indice::dataTime = initTm();

为避免可能的链接问题，请将函数设为static或将其放入未命名的命名空间。

To avoid possible linking problems, make the function static or put it in an unnamed namespace.

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