CGAL users discussion list

[Marc Glisse <>]

On Sat, 7 Dec 2019, Fritz Mueller wrote:

> I’m having some trouble getting set_error_handler() etc. working when 
> using the 5.0 release in its now default header-only mode.
>
> Looking into the sources a bit, get_static_error_handler() etc. are 
> define in header-only mode as inlines, returning references to local 
> statics.  I think this means each call could conceivably use different 
> storage for those statics,

No. A static variable inside a function is a unique global object. It is 
the usual way to simulate C++17 inline variables and get singletons.

> and indeed, some instrumentation indicates that this is what is 
> happening (if I log the address of _error_handler within 
> get_standard_error_hander(), I see multiple distinct addresses during a 
> run of my program.

That seems very broken. I would almost suspect that you are on windows, 
calling the function from several DLLs...

> This doesn’t seem like it is going to work correctly...  Is there a plan 
> for addressing set_error_handler() et. al. in header-only mode, as 
> non-header-only mode is now deprecated?

We need a testcase and details about your setup so we can reproduce the 
issue first, as with most bugs.

--
Marc Glisse