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Perl in a Nutshell, 2nd Edition
book

Perl in a Nutshell, 2nd Edition

by Nathan Patwardhan, Ellen Siever, Stephen Spainhour
June 2002
Beginner content levelBeginner
759 pages
80h 42m
English
O'Reilly Media, Inc.
Content preview from Perl in a Nutshell, 2nd Edition

Name

isa

Synopsis

$io = $fd->isa(type)

Returns true if the reference is blessed into package type or inherits from that package. Can be called as a static or object method call, or as a subroutine:

UNIVERSAL::isa(val, type)

Returns true if the first argument is a reference and either of the following is true:

  • val is a blessed reference and is blessed into package type or inherits from package type.

  • val is a reference to a type of Perl variable (e.g., 'HASH').

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Publisher Resources

ISBN: 0596002416Errata Page