Solved

reference

Posted on 2000-05-17
5
162 Views
Last Modified: 2010-03-05
when should i pass by reference?
($r, @d) = DBQuery(\%dbinfo, $sql);

what is the advantage of it?
0
Comment
Question by:mwhuen
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
5 Comments
 
LVL 12

Expert Comment

by:geotiger
ID: 2817969
Passing a reference is just passing a point, not the whole array or object. It is quicker, cheaper (using less memory), and safer (you do not need to keep two or more copies of the same data).
0
 
LVL 16

Accepted Solution

by:
maneshr earned 10 total points
ID: 2817975
foll is a general explanation of when references are very useful.

A Perl reference is a fundamental data type that "points" to another piece of data or code. A reference knows the location of
the information and what type of data is stored there.

A reference is a scalar and can be used anywhere a scalar can be used.

References are absolutely essential for creating complex data structures.

When you pass more than one array or hash to a subroutine, Perl merges all of them into the @_ array available within the
subroutine. The only way to avoid this merger is to pass references to the input arrays or hashes.
0
 
LVL 84

Expert Comment

by:ozo
ID: 2819985
perldoc perlref
0
 
LVL 16

Expert Comment

by:maneshr
ID: 2837273
did you get the answer you were looking for?

let us know.
0
 

Author Comment

by:mwhuen
ID: 2853955
Comment accepted as answer
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
hard perl script 16 168
Regular Expression question to filter with negation. 6 109
Control Number of Log Files -Perl 7 102
Perl: How to add backslashes to every period in a string 1 88
Email validation in proper way is  very important validation required in any web pages. This code is self explainable except that Regular Expression which I used for pattern matching. I originally published as a thread on my website : http://www…
I have been pestered over the years to produce and distribute regular data extracts, and often the request have explicitly requested the data be emailed as an Excel attachement; specifically Excel, as it appears: CSV files confuse (no Red or Green h…
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…

752 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question