ScompAndAbort

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Warning: These wiki pages have not been edited in years and may well be out of date/inaccurate. We recommend that you use them as a starting point for further investigation, rather than gospel.

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$m->scomp and $m->abort don't work together, even when you attempt to use eval {} to trap aborts.

Consider a top-level autohandler that wants to postprocess the page content manually before outputting it.

# WRONG
my $content = $m->scomp($m->fetch_next, %ARGS);
# Postprocess $content somehow

This doesn't work well because if any component decides to abort, the abort exception will fly right past the autohandler and its postprocessing.

You might then try

# WRONG
my $content;
eval { $content = $m->scomp($m->fetch_next, %ARGS) };
# Postprocess $content somehow

But that doesn't work either, because the exception will skip past the $content assignment until the point just after the eval {}.

What you want is

# RIGHT
my $content;
eval { $m->scomp({store=>\$content}, $m->fetch_next, %ARGS) };
# Postprocess $content somehow

The store modifier has the same effect as scomp, but it will work regardless of whether an exception occurs or not.