Fatal(3perl) - phpMan

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



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 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 AT math.edu>.



perl v5.10.0                                2011-06-30                               Fatal(3perl)

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