Beefy Boxes and Bandwidth Generously Provided by pair Networks
There's more than one way to do things
 
PerlMonks  

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
Hi Monks,

I know that In perl we can store any types of References using a single Scalar Variable;

like :-

$scale_ref = \$scalar;

$array_ref = \@array;

$hash_ref = \%hash'

I am devloping Modules which is going act as a Interface between many modules.

The requirement is as follows :-

* I want to make a Scalar Variable which has to hold only Array Reference.

For example :-

sub collect_all_users_from_tables { $table_list = @_; }
In the above example I want to make the $table_list to hold only Array reference.

Because as module developer I may not aware who is going to use my module. But I need to take care those

things in my module.

In othere Languages like C or C++ character pointer contain only character pointer.

I want the similaar things to be done in Perl also.

I know that this can be done in perl

But I am not aware of this. I hope monks will help me.

I need some efficient way of doing this.

This can be done by doing some explicit like

ref(@_) ne ARRAY' { + Carp 'Only Array can be processed'; }
Without explicit check is it possible to bring that future ?

"Keep pouring your ideas"

In reply to Strict to references of a particular Variable of particular type. by jesuashok

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others perusing the Monastery: (8)
    As of 2019-07-22 12:08 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?
      If you were the first to set foot on the Moon, what would be your epigram?






      Results (16 votes). Check out past polls.

      Notices?