C++中如何访问类变量
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/7077903/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How access class variables in c++
提问by buddy
Is it possible in c++ to access class variables in other classes without creating an object. I have tried to use static, but the other class doesnt recognize my variable. I have 3 classes. In two of those the sae variables should be used. In the third class I am changing the values. Would be grateful if you could help. Maybe youve got an example.
在 C++ 中是否可以在不创建对象的情况下访问其他类中的类变量。我尝试使用静态，但另一个类无法识别我的变量。我有 3 节课。在其中两个中，应该使用 sae 变量。在第三堂课中，我正在更改值。如果您能提供帮助，将不胜感激。也许你有一个例子。
采纳答案by Alok Save
class Myclass
{
public:
static int i;
};
int Myclass::i = 10;
class YourClass
{
public:
void doSomething()
{
Myclass::i = 10; //This is how you access static member variables
}
};
int main()
{
YourClass obj;
obj.doSomething();
return 0;
}
回答by Frerich Raabe
staticis the right keyword here:
static是正确的关键字：
class A {
public:
static int i; // <-- this is a class variable
};
class B {
public:
void f() { A::i = 3; } // <-- this is how you access class variables
};
They only potential problem I can think of is that
他们唯一我能想到的潜在问题是
- You made the class variable
protectedorprivate, thus rendering it inaccessible from other code. - You forgot to specify the full scope of the class variable (with
A::in this example).
- 您使类变量
protectedorprivate，从而使其无法从其他代码访问。 - 您忘记指定类变量的完整范围（
A::在本例中为）。
回答by DanDan
I think the Singleton Patternwould help, but I'm no big fan of it. A lot better design would be to have one class take ownership of the object, and pass references to this object to the other classes.
我认为单例模式会有所帮助，但我不是它的忠实粉丝。更好的设计是让一个类获得对象的所有权，并将对该对象的引用传递给其他类。
回答by Kriss Sachintha
yes you can bro, try this
是的，你可以，兄弟，试试这个
struct car{
结构车{
string model;
string paint;
int price;
};
int main(){
// creates an object of the class car
car BMW;
// assign the values
bmw.model = "m sports";
bmw.paint ="red";
bmw.price = 24000;
}
