typeid question

[michael]

Hi All,

I have the following:

class ClassA {
};

class ClassB {
};

int main(){
ClassA a;
ClassB b;

cout << typeid(a).name() << endl;
cout << typeid(b).name() << endl;
}

when this executes it prints:

6ClassA
6ClassB

Where does the '6' come from?

Thanks for your help

Regards Michael

 

[Michael DOUBEZ]

michael a écrit :

[snip]
cout << typeid(a).name() << endl;
cout << typeid(b).name() << endl;

when this executes it prints:

6ClassA
6ClassB

Where does the '6' come from?

It is the length of the string I guess.

Note: The output of typeid().name() is implementation defined.

Michael

 

[Vallabha]

Hi All,

I have the following:

class ClassA {

};

class ClassB {

};

int main(){
ClassA a;
ClassB b;

cout << typeid(a).name() << endl;
cout << typeid(b).name() << endl;

}

when this executes it prints:

6ClassA
6ClassB

Where does the '6' come from?

Thanks for your help

Regards Michael

I compiled your code on my Solaris box and it gave me correct results.

../a.out
classA
classB

I used Sun Studio11 C++ compiler.

Cheers
-Vallabha
S7 Software Solutions
http://www.s7solutions.com/

 

[Ron Natalie]

I compiled your code on my Solaris box and it gave me correct results.

./a.out
classA
classB

The results are correct on both machines. The return of typeid is
implementation specific. There's no guarantee that it's meaningful
to humans at all. It's certainly NOT unique (nor required to be) for
distinct types.

 

[James Kanze]

The results are correct on both machines. The return of typeid is
implementation specific. There's no guarantee that it's meaningful
to humans at all. It's certainly NOT unique (nor required to be) for
distinct types.

In fact, an empty string for every type would also be
conforming. It's also not required to be the same for the same
type; outputting the address of the typeid object would also be
conform. (On the other hand, it's implementation defined, so
the implementation is required to document what it does.)

Some implementations choose to do something useful. Others not.