[omniORB] _var Mapping Question

[Bruce Visscher]

If this isn't a FAQ, it should be.

Ken Feuerman wrote:
> 
> I'd like to do something like the following:
> 
> T_var myvar;  // empty initialization
> 
> try
> {
>     myvar = // Something that will likely throw
> }
> catch (...)
> {
>     // oh well, didn't really need myvar anyhow
> }
> 
> if (myvar != "NULL")   // (**)

You can use T::_nil() here.

> {
>     // do something with a non-"NULL" myvar
> }
> 
> Basically, in the line marked by (**), I need to check if the T_var
> variable was ever assigned to successfully within the try{} block.  Is
> there some ORB-portable way to check if a T_var is still "empty initialized"?
> 
> By the way, I tried (!CORBA::is_nil(myvar)) for (**) above, and that did
> not seem to work.
> 

Exactly how did it fail?

The following program prints "Hello world!" on my screen:

#include <iostream>
#include "foo.hh"

int main() {
    foo_var myvar;
    if (CORBA::is_nil(myvar))
        std::cout << "Hello world!";
}

Bruce