Ubuntu Manpage: Check::ISA - DWIM, correct checking of an object's class.

Provided by: libcheck-isa-perl_0.09-2_all

NAME

       Check::ISA - DWIM, correct checking of an object's class.

VERSION

       Version 0.09

SYNOPSIS

           use Check::ISA;

           if (obj($foo, "SomeClass")) {
               $foo->some_method;
           }

           # instead of one of these methods:
           UNIVERSAL::isa($foo, "SomeClass") # WRONG
           ref $obj eq "SomeClass"; # VERY WRONG
           $foo->isa("SomeClass") # May die
           local $@; eval { $foo->isa("SomeClass") } # too long

DESCRIPTION

       This module provides several functions to assist in testing whether a value is an object,
       and if so asking about its class.

FUNCTIONS

       obj $thing, [ $class ]
           This function tests if $thing is an object.

           If $class is provided, it also tests tests whether "$thing->isa($class)".

           $thing is considered an object if it's blessed or a "GLOB" with a valid "IO" slot (the
           "IO" slot contains a FileHandle object which is the actual invocant).  This
           corresponds directly to "gv_fetchmethod".

       obj_does $thing, [ $class_or_role ]
           Just like "obj" but uses "DOES" in UNIVERSAL instead of "isa" in UNIVERSAL.

           "DOES" in UNIVERSAL is just like "isa" except it's use is encouraged to query about an
           interface, as opposed to the object structure. If "DOES" is not overridden by the
           ebject, calling it is semantically identical to calling "isa".

           This is probably reccomended over "obj" for interoperability but can be slower on
           Perls before 5.10.

           Note that "DOES" in UNIVERSAL

       inv $thing, [ $class_or_role ]
           Just like "obj_does", but also returns true for classes.

           Note that this method is slower, but is supposed to return true for any value you can
           call methods on (class, object, filehandle, etc).

           Look into autobox if you would like to be able to call methods on all values.

       obj_can $thing, $method
       inv_can $thing, $method
           Checks if $thing is an object or class, and calls "can" on $thing if appropriate.

REPOSITORY

       <https://github.com/manwar/Check-ISA>

BUGS

       Please report any bugs or feature requests to "bug-check-isa at rt.cpan.org",  or through
       the web interface at <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Check-ISA>.  I will
       be notified and then you'll automatically be notified of progress on your bug as I make
       changes.

SUPPORT

       You can find documentation for this module with the perldoc command.

           perldoc Check::ISA

       You can also look for information at:

       •   RT: CPAN's request tracker (report bugs here)

           <http://rt.cpan.org/NoAuth/Bugs.html?Dist=Check-ISA>

       •   AnnoCPAN: Annotated CPAN documentation

           <http://annocpan.org/dist/Check-ISA>

       •   CPAN Ratings

           <http://cpanratings.perl.org/d/Check-ISA>

       •   Search CPAN

           <http://search.cpan.org/dist/Check-ISA/>

AUTHOR

       Yuval Kogman <nothingmuch@woobling.org>

       Currently maintained by Mohammad S Anwar (MANWAR), "<mohammad.anwar at yahoo.com>"

LICENSE AND COPYRIGHT

Any use, modification, and distribution of the Standard or Modified Versions is governed
by this License. By using, modifying or distributing the Package, you accept this
license. Do not use, modify, or distribute the Package, if you do not accept this license.

If your Modified Version has been derived from a Modified Version made by someone other
than you,you are nevertheless required to ensure that your Modified Version
complies with the requirements of this license.

This license does not grant you the right to use any trademark, service mark,
tradename, or logo of the Copyright Holder.

This license includes the non-exclusive, worldwide, free-of-charge patent license to make,
have made, use, offer to sell, sell, import and otherwise transfer the Package with
respect to any patent claims licensable by the Copyright Holder that are necessarily
infringed by the Package. If you institute patent litigation (including a cross-claim
or counterclaim) against any party alleging that the Package constitutes direct or
contributory patent infringement, then this License to you shall terminate on the date
that such litigation is filed.

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