Why doesn't this work?
class MyClass
{
private:
static float myStaticVariable;
public:
static void setStaticVariable(float anotherVariable);
};
MyClass::myStaticVariable = 10.1;
// Offending section
static void MyClass::setStaticVariable
{
myStaticVariable = anotherVariable;
}
int main()
{
MyClass A;
A.setStaticVariable(5.1);
return 0;
}
Must all static member functions of the class be defined inside the class?
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You've already declare the method static in the class definition, remove static from the method inplementation. E.g.,
void MyClass::setStaticVariable
{
myStaticVariable = anotherVariable;
}
Secondly, instantiate the static variable correctly. E.g.,
float MyClass::myStaticVariable = 10.1;
Regards.
It's true, there's another mistake that I didn't spot. You do certainly need "float" before "MyClass::myStaticVariable
It's not logical why you have to restate that it's a float, but not that it's a static... but this pattern is definitely part of the rules of the language.
Peter, I think I got the answer I needed.
Thanks for the answers, peterdownes and glebspy.
I get that if we've declared anything (data member or member function) as static, we don't have to add the static keyword in the implementation, as pointed out by peter.
Don't know how to distribute the points... guess I'll just accept glebspy's answer, if you don't mind peter.
Peter, I think I got the answer I needed.
Thanks for the answers, peterdownes and glebspy.
I get that if we've declared anything (data member or member function) as static, we don't have to add the static keyword in the implementation, as pointed out by peter.
Don't know how to distribute the points... guess I'll just accept glebspy's answer, if you don't mind peter.
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by: glebspyPosted on 2002-10-20 at 23:17:23ID: 7351053
No, they dont have to be defined in the class. But when you define them outside the class, you shouldn't label them static (even though they the computer still knows they are static). Remove the keyword "static" from the "Offending section" and your code should not have that problem any more.
There's no particular reason, it's just how the language turned out. It's the same with the word "virtual".