Comparing Exceptions and Errors

[kdevel]

On Monday, 13 June 2022 at 13:15:42 UTC, Steven Schveighoffer 
wrote:

> Possibly, but I don't close the handle. It goes back to a pool 
> to get reused.

Um. I need a (fresh) connection per CGI process. I wonder if 
nowadays the TLS startup between the browser and the webserver 
isn't at least one or two magnitudes more expensive than the 
(unencrypted) connection to the domain socket of the DB engine. 
May pooling DB connections instead of closing them be optimizing 
on the wrong end?

>> Why not have a Transaction class (struct)?
>
> A transaction class/struct cannot hook normal return and 
> throwing differently (the destructor has no way of knowing 
> whether an exception is in flight).

Regarding C++: “[...] In a proper robust design, commits should 
always be explicit and destructors only rollback uncommitted 
transactions. [...]

There is now enough introspection in the language to actually 
implement implicit commit in a non exceptional path, but I think 
it would be a mistake."

[1] https://news.ycombinator.com/item?id=24648406