如何声明一个可以在整个程序中使用的全局变量 [英] How to declare a global variable that could be used in the entire program

问题描述

我有一个变量，我想在所有我的类中使用，而不需要将它传递给类的构造函数每次我想使用它。

I have a variable that I would like to use in all my classes without needing to pass it to the class constructor every time I want use it. How would I accomplish this in C++?

谢谢。

推荐答案

global.h
extern int myVar;

global.cpp
#include "global.h"
int myVar = 0;  // initialize

class1.cpp
#include "global.h"
...

class2.cpp
#include "global.h"
...

class3.cpp
#include "global.h"
...

MyVar将作为全局变量在每个模块中被识别和使用。你不必有global.cpp。你可以在任何类.cpp中初始化myVar，但我认为这对于更大的程序更干净。

MyVar will be known and usable in every module as a global variable. You do not have to have global.cpp. You could initialize myVar in any of the class .cpp's but I think this is cleaner for larger programs.

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