icon Top 9 categories map      RocketAware > Perl >

wantarray may return undef

Tips: Browse or Search all pages for efficient awareness of Perl functions, operators, and FAQs.


Search Perl pages


By activity
Professions, Sciences, Humanities, Business, ...

User Interface
Text-based, GUI, Audio, Video, Keyboards, Mouse, Images,...

Text Strings
Conversions, tests, processing, manipulation,...

Integer, Floating point, Matrix, Statistics, Boolean, ...

Algorithms, Memory, Process control, Debugging, ...

Stored Data
Data storage, Integrity, Encryption, Compression, ...

Networks, protocols, Interprocess, Remote, Client Server, ...

Hard World
Timing, Calendar and Clock, Audio, Video, Printer, Controls...

File System
Management, Filtering, File & Directory access, Viewers, ...


wantarray may return undef

The wantarray operator returns true if a subroutine is expected to return a list, and false otherwise. In Perl 5.004, wantarray can also return the undefined value if a subroutine's return value will not be used at all, which allows subroutines to avoid a time-consuming calculation of a return value if it isn't going to be used.

Source: what's new for perl5.004
Copyright: Larry Wall, et al.
Next: Changes to tainting checks

Previous: No resetting of $. on implicit close

(Corrections, notes, and links courtesy of RocketAware.com)

[Overview Topics]

Rapid-Links: Search | About | Comments | Submit Path: RocketAware > Perl > perldelta/C_wantarray_may_return_undef.htm
RocketAware.com is a service of Mib Software
Copyright 2000, Forrest J. Cavalier III. All Rights Reserved.
We welcome submissions and comments