do static functions get inherited?

[ashok]

I have a confusion.
Do static member functions of base class get inherited to derived
class?

I searched for this answer but nowhere I get any referencec saying
"derived class inherits static functions with other member functions
of the base class".
regds,
arj

[Victor Bazarov]

ashok wrote:

I have a confusion.
Do static member functions of base class get inherited to derived
class?
Yes.
I searched for this answer but nowhere I get any referencec saying
"derived class inherits static functions with other member functions
of the base class".

Any member function is inherited (unless it's private). It may be
inaccessible due to name hiding, but it is always there.

Are you experiencing any particular problem?

V

[DaKoadMunky]

>Any member function is inherited

What about assignment operators?

[Victor Bazarov]

DaKoadMunky wrote:

Any member function is inherited

What about assignment operators?

Yes. The problem is that they are hidden by class' own assignment
operator (even if it's compiler-defined).

#include <iostream>
struct B {
B& operator=(const B&) {
std::cout << "B=B\n"; return *this; }
};

struct D : B {};

int main() {
D d1, d2;
d1.B::operator=(d2);
}

Constructors and destructors are not inherited. But those are
truly special functions.

V

[DaKoadMunky]

>Yes. The problem is that they are hidden by class' own assignment

operator (even if it's compiler-defined).

#include <iostream>
struct B {
B& operator=(const B&) {
std::cout << "B=B\n"; return *this; }
};

struct D : B {};

int main() {
D d1, d2;

I am hoping that Santa Claus will bring me the C++ Standard for Christmas, but
until then I will have to quote TCPPPL 2nd Ed. pg 593...

"The assignment function operator=() must be a nonstatic member function; it is
not inherited"

Maybe this is an error or has changed?

struct Base
{
void operator=(int)
{
}
};

struct Derived : Base
{
};

int main()
{
Derived d;
d = 3;

return 0;
}

The above produces an error on both Comeau and VC++.

If I introduce a using declaration into struct Derived...

struct Derived : Base
{
using Base::operator=();
};
Comeau accepts d = 3 but VC++ still does not.

I don't know which one is correct.

[ARatio]

"DaKoadMunky" <da*********@aol.com> wrote in message
news:20***************************@mb-m14.aol.com...

Yes. The problem is that they are hidden by class' own assignment
operator (even if it's compiler-defined).

#include <iostream>
struct B {
B& operator=(const B&) {
std::cout << "B=B\n"; return *this; }
};

struct D : B {};

int main() {
D d1, d2;

I am hoping that Santa Claus will bring me the C++ Standard for Christmas,

but until then I will have to quote TCPPPL 2nd Ed. pg 593...

"The assignment function operator=() must be a nonstatic member function; it is not inherited"

Maybe this is an error or has changed?

struct Base
{
void operator=(int)
{
}
};

struct Derived : Base
{
};

int main()
{
Derived d;
d = 3;

return 0;
}

The above produces an error on both Comeau and VC++.

If I introduce a using declaration into struct Derived...

struct Derived : Base
{
using Base::operator=();
};
Comeau accepts d = 3 but VC++ still does not.

I don't know which one is correct.

Question about this topic:

Why should I overload the operator= instead of create a copy constructor?

ernesto

[DaKoadMunky]

Copy constructor is used to construct an object that is a copy of an existing
object...

T t1;
T t2(t1);

Copy assignment is used to assign an existing object to an existing object...

T t3,t4;
t3 = t4;

[DaKoadMunky]

>>Why should I overload the operator= >>instead of create a copy constructor?

Copy constructor is used to construct an object that is a copy of an existing
object...

T t1;
T t2(t1);

Copy assignment is used to assign an existing object to an existing object...

T t3,t4;
t3 = t4;

I wanted to clarify which post I was responding to.

[Marcelo Pinto]

Victor Bazarov <v.********@comAcast.net> wrote in message news:<Ok****************@newsread1.dllstx09.us.to. verio.net>...

ashok wrote:

I have a confusion.
Do static member functions of base class get inherited to derived
class?

Yes.

I searched for this answer but nowhere I get any referencec saying
"derived class inherits static functions with other member functions
of the base class".

Any member function is inherited (unless it's private). It may be
inaccessible due to name hiding, but it is always there.

Are you experiencing any particular problem?

V

I believed private members were inherited, but inaccessible. I believe
they are there but you can't call them directly. Could you clarify
this point?

Marcelo Pinto