我在以下代码中遇到未定义的引用错误:
Hi i am getting undefined reference error in the following code:
class Helloworld{
public:
static int x;
void foo();
};
void Helloworld::foo(){
Helloworld::x = 10;
};
我不想要 static foo() 函数.如何在类的非 static 方法中访问类的 static 变量?
I don't want a static foo() function. How can I access static variable of a class in non-static method of a class?
我不想要一个
staticfoo()函数
好吧，foo() 在你的类中不是静态的，你不需要让它staticcode> 以访问您的类的 static 变量.
Well, foo() is not static in your class, and you do not need to make it static in order to access static variables of your class.
您需要做的只是为您的静态成员变量提供一个定义:
What you need to do is simply to provide a definition for your static member variable:
class Helloworld {
public:
static int x;
void foo();
};
int Helloworld::x = 0; // Or whatever is the most appropriate value
// for initializing x. Notice, that the
// initializer is not required: if absent,
// x will be zero-initialized.
void Helloworld::foo() {
Helloworld::x = 10;
};
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