Fatal(3) Perl Programmers Reference Guide Fatal(3)NAMEFatal - replace functions with equivalents which succeed or die
SYNOPSIS
use Fatal qw(open close);
sub juggle { . . . }
import Fatal 'juggle';
DESCRIPTION
"Fatal" provides a way to conveniently replace functions which normally
return a false value when they fail with equivalents which raise
exceptions if they are not successful. This lets you use these
functions without having to test their return values explicitly on each
call. Exceptions can be caught using "eval{}". See perlfunc and
perlvar for details.
The do-or-die equivalents are set up simply by calling Fatal's "import"
routine, passing it the names of the functions to be replaced. You may
wrap both user-defined functions and overridable CORE operators (except
"exec", "system" which cannot be expressed via prototypes) in this way.
If the symbol ":void" appears in the import list, then functions named
later in that import list raise an exception only when these are called
in void context--that is, when their return values are ignored. For
example
use Fatal qw/:void open close/;
# properly checked, so no exception raised on error
if(open(FH, "< /bogotic") {
warn "bogo file, dude: $!";
}
# not checked, so error raises an exception
close FH;
BUGS
You should not fatalize functions that are called in list context,
because this module tests whether a function has failed by testing the
boolean truth of its return value in scalar context.
AUTHOR
Lionel Cons (CERN).
Prototype updates by Ilya Zakharevich <ilya@math.ohio-state.edu>.
perl v5.10.0 2007-12-18 Fatal(3)
