MirOS Manual: warnings(3p)


warnings(3p)    Perl Programmers Reference Guide     warnings(3p)

NAME

     warnings - Perl pragma to control optional warnings

SYNOPSIS

         use warnings;
         no warnings;

         use warnings "all";
         no warnings "all";

         use warnings::register;
         if (warnings::enabled()) {
             warnings::warn("some warning");
         }

         if (warnings::enabled("void")) {
             warnings::warn("void", "some warning");
         }

         if (warnings::enabled($object)) {
             warnings::warn($object, "some warning");
         }

         warnings::warnif("some warning");
         warnings::warnif("void", "some warning");
         warnings::warnif($object, "some warning");

DESCRIPTION

     The "warnings" pragma is a replacement for the command line
     flag "-w", but the pragma is limited to the enclosing block,
     while the flag is global. See perllexwarn for more informa-
     tion.

     If no import list is supplied, all possible warnings are
     either enabled or disabled.

     A number of functions are provided to assist module authors.

     use warnings::register
         Creates a new warnings category with the same name as
         the package where the call to the pragma is used.

     warnings::enabled()
         Use the warnings category with the same name as the
         current package.

         Return TRUE if that warnings category is enabled in the
         calling module. Otherwise returns FALSE.

     warnings::enabled($category)
         Return TRUE if the warnings category, $category, is
         enabled in the calling module. Otherwise returns FALSE.

perl v5.8.8                2005-02-05                           1

warnings(3p)    Perl Programmers Reference Guide     warnings(3p)

     warnings::enabled($object)
         Use the name of the class for the object reference,
         $object, as the warnings category.

         Return TRUE if that warnings category is enabled in the
         first scope where the object is used. Otherwise returns
         FALSE.

     warnings::warn($message)
         Print $message to STDERR.

         Use the warnings category with the same name as the
         current package.

         If that warnings category has been set to "FATAL" in the
         calling module then die. Otherwise return.

     warnings::warn($category, $message)
         Print $message to STDERR.

         If the warnings category, $category, has been set to
         "FATAL" in the calling module then die. Otherwise
         return.

     warnings::warn($object, $message)
         Print $message to STDERR.

         Use the name of the class for the object reference,
         $object, as the warnings category.

         If that warnings category has been set to "FATAL" in the
         scope where $object is first used then die. Otherwise
         return.

     warnings::warnif($message)
         Equivalent to:

             if (warnings::enabled())
               { warnings::warn($message) }

     warnings::warnif($category, $message)
         Equivalent to:

             if (warnings::enabled($category))
               { warnings::warn($category, $message) }

     warnings::warnif($object, $message)
         Equivalent to:

             if (warnings::enabled($object))
               { warnings::warn($object, $message) }

perl v5.8.8                2005-02-05                           2

warnings(3p)    Perl Programmers Reference Guide     warnings(3p)

     See "Pragmatic Modules" in perlmodlib and perllexwarn.

perl v5.8.8                2005-02-05                           3

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