Access static member variables

[Rahul]

Hi Everyone,

I have the following code,

class Sample
{
public: static int i;
void f()
{
Sample::i = 5;
}
};

int main()
{
Sample obj;
obj.f(); // Causes linker error saying unresolved
external symbol Sample::i...
}

It works fine, if the following statement is added before main and
after the class declaration,

int Sample::i;

Does the above statement take care of memory allocation for the
static member variable?

 

[Victor Bazarov]

Hi Everyone,

I have the following code,

class Sample
{
public: static int i;
void f()
{
Sample::i = 5;

There is no need to qualify the name 'i' here, BTW.

}
};

int main()
{
Sample obj;
obj.f(); // Causes linker error saying unresolved
external symbol Sample::i...
}

It works fine, if the following statement is added before main and
after the class declaration,

int Sample::i;

Does the above statement take care of memory allocation for the
static member variable?

Yes.

V

 

[red floyd]

Hi Everyone,

I have the following code,

class Sample
{
public: static int i;
void f()
{
Sample::i = 5;
}
};

int main()
{
Sample obj;
obj.f(); // Causes linker error saying unresolved
external symbol Sample::i...
}

It works fine, if the following statement is added before main and
after the class declaration,

int Sample::i;

Does the above statement take care of memory allocation for the
static member variable?

Yes. See FAQ 10.11 http://parashift.com/c++-faq-lite/ctors.html#faq-10.11