[Synopsis-devel] Re: Synopsis Question

[Stefan Seefeld]

Luke Petre wrote:

>> Thanks for looking into this ! Does the file compile if you simply
>> replace '::callback' by 'callback' everywhere, i.e. don't qualify
>> 'callback' any more ?
>>
> 
> Yes.  The only line that really matters is in the sighandler function.  
> The reference in the constructor of ErrorHandler compiles either way.  
> My 2c is that while you're in the anonymous namespace, the '::' is 
> forcing the compiler to only consider symbols outside of the current 
> namespace.  Or something strange like that.

Right. Unfortunately I don't remember why I introduced the qualification
in the first place. I'v removed it now, so everything should work fine.

>> That's right, but that defeats the purpose of the anonymous namespace to
>> deliberately hide the symbols it declares from the outside.
>>
> 
> Hrm.  If I follow what you're saying, the use of anonymous namespaces 
> here is to prevent something like this:
> 
> // file.cc
> namespace Synopsis
> {
>  extern ErrorHandler::Callback callback;
> }
> 
> void foo()
> {
>  if ( Synopsis::callback ) Synopsis::callback();
> }
> 
> I guess I've never really thought about enforcing restricted access like 
> that.  Pretty cool.

Exactly. It is the equivalent of C's 'static'.

Regards,
		Stefan