1Check::ISA(3)         User Contributed Perl Documentation        Check::ISA(3)
2
3
4

NAME

6       Check::ISA - DWIM, correct checking of an object's class.
7

VERSION

9       Version 0.09
10

SYNOPSIS

12           use Check::ISA;
13
14           if (obj($foo, "SomeClass")) {
15               $foo->some_method;
16           }
17
18           # instead of one of these methods:
19           UNIVERSAL::isa($foo, "SomeClass") # WRONG
20           ref $obj eq "SomeClass"; # VERY WRONG
21           $foo->isa("SomeClass") # May die
22           local $@; eval { $foo->isa("SomeClass") } # too long
23

DESCRIPTION

25       This module provides several functions to assist in testing whether a
26       value is an object, and if so asking about its class.
27

FUNCTIONS

29       obj $thing, [ $class ]
30           This function tests if $thing is an object.
31
32           If $class is provided, it also tests tests whether
33           "$thing->isa($class)".
34
35           $thing is considered an object if it's blessed or a "GLOB" with a
36           valid "IO" slot (the "IO" slot contains a FileHandle object which
37           is the actual invocant).  This corresponds directly to
38           "gv_fetchmethod".
39
40       obj_does $thing, [ $class_or_role ]
41           Just like "obj" but uses "DOES" in UNIVERSAL instead of "isa" in
42           UNIVERSAL.
43
44           "DOES" in UNIVERSAL is just like "isa" except it's use is
45           encouraged to query about an interface, as opposed to the object
46           structure. If "DOES" is not overridden by the ebject, calling it is
47           semantically identical to calling "isa".
48
49           This is probably reccomended over "obj" for interoperability but
50           can be slower on Perls before 5.10.
51
52           Note that "DOES" in UNIVERSAL
53
54       inv $thing, [ $class_or_role ]
55           Just like "obj_does", but also returns true for classes.
56
57           Note that this method is slower, but is supposed to return true for
58           any value you can call methods on (class, object, filehandle, etc).
59
60           Look into autobox if you would like to be able to call methods on
61           all values.
62
63       obj_can $thing, $method
64       inv_can $thing, $method
65           Checks if $thing is an object or class, and calls "can" on $thing
66           if appropriate.
67

SEE ALSO

69       UNIVERSAL, Params::Util, autobox, Moose, asa
70

REPOSITORY

72       <https://github.com/manwar/Check-ISA>
73

BUGS

75       Please report any bugs or feature requests to "bug-check-isa at
76       rt.cpan.org",  or through the web interface at
77       <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Check-ISA>.  I will  be
78       notified and then you'll automatically be notified of progress on your
79       bug as I make changes.
80

SUPPORT

82       You can find documentation for this module with the perldoc command.
83
84           perldoc Check::ISA
85
86       You can also look for information at:
87
88       •   RT: CPAN's request tracker (report bugs here)
89
90           <http://rt.cpan.org/NoAuth/Bugs.html?Dist=Check-ISA>
91
92       •   AnnoCPAN: Annotated CPAN documentation
93
94           <http://annocpan.org/dist/Check-ISA>
95
96       •   CPAN Ratings
97
98           <http://cpanratings.perl.org/d/Check-ISA>
99
100       •   Search CPAN
101
102           <http://search.cpan.org/dist/Check-ISA/>
103

AUTHOR

105       Yuval Kogman <nothingmuch@woobling.org>
106
107       Currently maintained by Mohammad S Anwar (MANWAR), "<mohammad.anwar at
108       yahoo.com>"
109

111       Copyright (c) 2008 Yuval Kogman.
112
113       Copyright (c) 2016 Mohammad S Anwar.
114
115       All rights reserved. This program is free software; you can
116       redistribute it and / or modify it under the same terms as Perl itself.
117
118       Any  use,  modification, and distribution of the Standard or Modified
119       Versions is governed  by  this License. By  using, modifying or
120       distributing the Package, you accept this license. Do not use, modify,
121       or distribute the Package, if you do not accept this license.
122
123       If your Modified Version has been derived from a Modified Version made
124       by someone other than you,you are nevertheless required to ensure that
125       your Modified Version
126        complies with the requirements of this license.
127
128       This  license  does  not grant you the right to use any trademark,
129       service mark, tradename, or logo of the Copyright Holder.
130
131       This license includes the non-exclusive, worldwide, free-of-charge
132       patent license to make,  have made, use,  offer to sell, sell, import
133       and otherwise transfer the Package with respect to any patent claims
134       licensable by the Copyright Holder that are  necessarily  infringed  by
135       the  Package. If you institute patent litigation (including  a  cross-
136       claim  or  counterclaim) against any party alleging that the Package
137       constitutes direct or contributory patent infringement, then this
138       License to you shall terminate on the date that such litigation is
139       filed.
140
141       Disclaimer  of  Warranty:  THE  PACKAGE  IS  PROVIDED BY THE COPYRIGHT
142       HOLDER AND CONTRIBUTORS  "AS IS'  AND WITHOUT ANY EXPRESS OR IMPLIED
143       WARRANTIES. THE IMPLIED WARRANTIES    OF   MERCHANTABILITY,   FITNESS
144       FOR   A   PARTICULAR  PURPOSE, OR NON-INFRINGEMENT ARE DISCLAIMED TO
145       THE EXTENT PERMITTED BY YOUR LOCAL LAW. UNLESS REQUIRED BY LAW, NO
146       COPYRIGHT HOLDER OR CONTRIBUTOR WILL BE LIABLE FOR ANY DIRECT,
147       INDIRECT, INCIDENTAL,  OR CONSEQUENTIAL DAMAGES ARISING IN ANY WAY OUT
148       OF THE USE OF THE PACKAGE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
149       DAMAGE.
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153perl v5.36.0                      2022-07-22                     Check::ISA(3)
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