Implementation in a *.h file

[Neo]

Hi,
I have a single a.h file which also contains the class implementation
because it is small and I have included this in another file which
needs this class definitions. It compiles fine but I get a linker
error saying "undefined symbol **classx" which is the class defined in
a.h file. Is there something I am missing?


Thanks,
Neo

 

[Ian Collins]

Hi,
I have a single a.h file which also contains the class implementation
because it is small and I have included this in another file which
needs this class definitions. It compiles fine but I get a linker
error saying "undefined symbol **classx" which is the class defined in
a.h file. Is there something I am missing?

Post an example.

 

[Neo]

Post an example.

ok, here it is-
//a.h
class D: public B {
.....
.....
D(){}
~D(){}
.....
.....
};
//end a.h

//test.h
#include a.h
class C {
D *Dptr;
....
....
C() {
Dptr = new D;
....
}

};
// end test.h

I just deciphered the undefined symbol and it happens to the vtable of
class D. I have made the destructor of B to be virtual.

Thanks,
Neo

 

[Ian Collins]

I just deciphered the undefined symbol and it happens to the vtable of
class D. I have made the destructor of B to be virtual.

Sounds like you are missing the definition of a virtual method.

 

[Neo]

Sounds like you are missing the definition of a virtual method.

Spot on!, yeah forgot that simple detail.

Thanks,
Neo