Re: Over-riding static functions/data
John wrote:
Is it permissible to over-ride a static function or member data in a
class?
Not sure what you mean by 'overriding' here. In C++ the term is used in
reference to virtual functions only.
> The code below works as I would expect and compiles without
error, but I am wondering if it is standard or if it is discouraged
practice (and if so, why?).
It's perfectly fine, from what I can see.
Public member data and public member functions are simply part of the
interface of the class. If your interface requirements call for having
such data and functions, that's what you have to do.
The members like this do not participate in dynamic polymorphism (you
can't call 'B's 'GetName' member through a pointer to 'A', even if you
originally create the object as a 'B'), that is achieved through virtual
functions. Static data and functions can, of course, participate in
"static polymorphism" (when your class is used in a template), and as
such are elements of "duck typing" (look it up).
Thanks,
John
===== a.hpp =====
#include<string>
class A
{
public:
static std::string m_name;
static std::string GetName() { return m_name; }
};
class B : public A
{
public:
static std::string m_name;
static std::string GetName() { return m_name; }
};
===== a.cpp =====
#include <iostream>
#include "a.hpp"
std::string A::m_name = "a";
std::string B::m_name = "b";
int main()
{
A aa;
B bb;
std::cout << aa.m_name << std::endl;
std::cout << bb.m_name << std::endl;
std::cout << aa.GetName() << std::endl;
std::cout << bb.GetName() << std::endl;
return 0;
}
V
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