Re: [Boost-users] Exceptions and throwing across module boundaries

On Wed, Nov 11, 2009 at 4:06 PM, Emil Dotchevski wrote:

On Wed, Nov 11, 2009 at 2:08 PM, Josh Faust wrote:

...

we hit a case where an exception thrown in one module cannot be caught as anything but a std::exception in a module compiled with different settings (same compiler -- gcc 4.2).

The fact that catch(std::exception&) works for you is a coincidence.

Yeah, that was just an example.

...

Since we'd prefer to use exceptions rather than return codes as our error reporting mechanism, I'm currently investigating possible solutions to this. I was hoping to find something applicable boost, but it looks like boost doesn't differentiate between throwing in a header vs. throwing in a module -- for example, Boost.Thread has a few throw statements in cpp files Is this just an issue that hasn't been enough of a problem to address?

In general, a library might not work at all if its CPP files are compiled with different settings than the user code, even if it didn't throw any exceptions, because C and C++ do not define an ABI.

I suppose my impression was that exceptions are an even worse case -- but now that I think about it we've run into other compiler setting ABI issues before as well. Maybe this is a non-issue because we're not trying to provide a perfectly clean interface (char* and other builtins only). Thanks Josh

Emil Dotchevski Reverge Studios, Inc. http://www.revergestudios.com/reblog/index.php?n=ReCode _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users