Re: [boost] Exception Visitor

From: Alexander Nasonov (alnsn_at_[hidden])
Date: 2006-07-27 17:44:09

Jeremy Day wrote:
>There are two reasons, really.  The first reason is that it isn't something
>that I have considered before.  I have spent essentially zero time looking
>at the preprocessor library.  The second reason is that using the
>preprocessor just doesn't seem as much fun.  I will explore that idea,
>though, since it is something that I don't have much experience with.

Believe me, Boost.Preprocessor is fun. Overusing it is not fun but it's a more general principle that can be applied to many other C++ features.
PP is especially good for libraries.

Two reasons why I would consider PP version:

1. catch(...) followed by rethrow might be less efficient than handle-seq. I never measured this, though.
2. catch(...) catches too many things on some compilers. I know only one (very popular) compiler that also catches system exceptions (aka SEH). Though, I don't remember how it rethrows those exceptions.

Another possible problem is that a stack trace of original throw instruction might be replaced with subsequent throw inside catch(...). It has been discussed in this thread but only for few compilers, IIRC.
--
Alexander Nasonov