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 suc
cessful. This lets you use these functions without having
to test their return values explicitly on each call.
Exceptions can be caught using "eval{}". See the perlfunc
manpage and the perlvar manpage 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 excep
tion 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;
AUTHOR
Lionel.Cons@cern.ch
prototype updates by Ilya Zakharevich ilya@math.ohio-
state.edu
2001-02-22 perl v5.6.1 Fatal(3)
