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Fatal(3)               Perl Programmers Reference Guide               Fatal(3)



NAME
       Fatal - 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 exam-
       ple

               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.ConsATcern.ch

       prototype updates by Ilya Zakharevich ilyaATmath.edu



perl v5.8.8                       2001-09-21                          Fatal(3)