icon Top 9 categories map      RocketAware > Perl >

Is it unsafe to return a pointer to local data?

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



Home

Search Perl pages


Subjects

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

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

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

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

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

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

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

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

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

    

Is it unsafe to return a pointer to local data?

No, Perl's garbage collection system takes care of this.

    sub makeone {
        my @a = ( 1 .. 10 );
        return \@a;
    }

    for $i ( 1 .. 10 ) {
        push @many, makeone();
    }

    print $many[4][5], "\n";

    print "@many\n";


Source: Perl FAQ: Programming Tools
Copyright: Copyright (c) 1997 Tom Christiansen and Nathan Torkington.
Next: How can I free an array or hash so my program shrinks?

Previous: How can I make my Perl program take less memory?



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


[Overview Topics]

Up to: PERL




Rapid-Links: Search | About | Comments | Submit Path: RocketAware > Perl > perlfaq3/Is_it_unsafe_to_return_a_pointer.htm
RocketAware.com is a service of Mib Software
Copyright 2000, Forrest J. Cavalier III. All Rights Reserved.
We welcome submissions and comments