帮助C ++静态方法 [英] Help with C++ static method

问题描述

有可能从C ++中的静态方法返回对象，就像在Java中一样吗？我这样做：

Is it possible to return an object from a static method in C++ like there is in Java? I am doing this:

class MyMath {
    public:
       static MyObject calcSomething(void);
    private:
};

我想这样做：

And I want to do this:

int main() { 
    MyObject o = MyMath.calcSomething(); // error happens here
}

在MyMath类中只有静态方法，没有点实例化它。但我得到这个编译错误：

There are only static methods in the MyMath class, so there's no point in instantiating it. But I get this compile error:

MyMath.cpp：69：错误：预期的主表达式'。'token

MyMath.cpp:69: error: expected primary-expression before '.' token

我做错了什么？我是否已实例化MyMath？

What am I doing wrong? Do I have to instantiate MyMath? I would rather not, if it is possible.

推荐答案

使用 :: c>

Use :: instead of .

MyObject o = MyMath :: calcSomething code>

MyObject o = MyMath::calcSomething();

当你调用没有类的对象的方法时，你应该使用 :: 符号。你也可以通过类对象或指向它们的指针调用静态方法，在这种情况下你应该使用通常的。或 - > 符号：

When you are calling the method without the object of the class you should use :: notation. You may also call static method via class objects or pointers to them, in this case you should use usual . or -> notation:

MyObject obj;
MyObject* p = new MyObject();

MyObject::calcSomething();
obj.calcSomething();
p->calcSomething();

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