Kevin Sopp wrote:
The compiler cannot check that the right tag is used since information is added to the exception at runtime, so you're still vulnerable to typos. That means you would still have to either put the tags
you only declare them; and if you used different name than declared, compiler will catch that error. You may also declare that name wherever you want (if you keep the scope), because multiple declarations are not a problem (as opposed to multiple definitions). Presumably it would be best to put them in header files where these data are used.
or static strings in a
these have to be defined.
central header file to unify the exception handling code at the throw/catch site.
God forbid! "unified" exception handling is not something that boost should enforfce its users to do. Tags bring nice decoupling with basic static type safety; strings bring just decoupling OR compiler control with reduntant declaration/definition. I implemented similar "typeless vehicle for data" some time ago and I think I'm pretty familiar with its mechanics and potential (which goes much beyond exception handling). B.