Re: [Dev-C++] ostringstream and insertion operator problem

[A D <a_...@ho...>]

Thanks for your reply.=20
=20
=20
> Jonathan wrote:
> A reference to an object is actually a pointer, which is a number (to whi=
ch
> we have attached a special meaning)
> Testing this reference tests the pointer with 0, or NULL. I think you wil=
l
> find that << returns NULL if it fails.
=20
Still it's not clear to me. So you are sayin' that a function that returns =
a reference
type can return NULL for that same purpose. Suppose there's a code like thi=
s:
=20
#include=20
=20
class Aa
{
   public:
   int i;
   Aa& aFunc();
};
=20
Aa& Aa::aFunc()
{ =20
   return NULL;
}
=20
int main()
{
   Aa firstObj;
  =20
   firstObj.aFunc();
   return 0;
}
=20
aFunc() function supposed to return NULL. But i get the following compilati=
on=20
error:
=20
test.cc: In member function =91Aa& Aa::aFunc()=92:
test.cc:13: error: invalid initialization of non-const reference of type =
=91Aa&=92=20
from a temporary of type =91int=92
=20
if a function can return a NULL value instead of a reference value why this=
 code=20
and this function spewing this error?=20
=20
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