Get Advanced Perl Programming PDF


By Sriram Srinivasan

ISBN-10: 1565922204

ISBN-13: 9781565922204

No matter if your wisdom of Perl is informal or deep, this booklet will make you a extra finished programmer. It covers complicated thoughts for handling production-ready Perl courses and explains tools for manipulating information and gadgets that can have gave the impression of magic ahead of. in addition, it units Perl within the context of a bigger surroundings, giving you the historical past you would like for facing networks, databases, and GUIs. it's also a dialogue of internals that will help you application extra successfully and embed Perl inside of C or C inside of Perl. significant themes comprise the sensible use of programs and sessions (object-oriented programming), complicated information constructions, patience (e.g., utilizing a database), networking, graphical interfaces utilizing the Tk toolkit, interplay with c program languageperiod services, embedding and lengthening the Perl interpreter, and chosen internals.

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6. 7 shows the picture when you create a reference to an element of an array or a hash. 7: Referring to a list element When you take a reference to an element of an array (or a hash), Perl increments that scalar value's reference count. If, say, you now pop it from the array, its reference count goes down by 1 because the array is no longer interested in the scalar value. But since there is an outstanding reference to the array element (and its reference count is still 1), it is not destroyed. 8 shows the picture after @array has been popped once.

Let us say you want your script to process a command-line option such as "-Ddebug_level=3" and set the $debug_level variable. This is one way of doing it: while ($arg = shift @ARGV){ if ($arg =~ /-D(\w+)=(\w+)/) { $var_name = $1; $value = $2; $$var_name = $value; # Or more compactly, $$1 = $2; } } On the other hand, Perl's eagerness to try its damnedest to get an expression to work sometimes doesn't help. In the preceding examples, if you expected the program logic to have a real reference instead of a string, then you would have wanted Perl to point it out instead of making assumptions about your usage.

To make the matrix routines developed in the previous section work for this new representation, it might seem a simple matter to convert all square brackets to braces. True, it'll work, but there's a subtle problem. Let's say that the entire third row of a matrix is zero-valued (so there's no entry for $r_mat->{2}). Now, if you do this: $element = $r_mat->{2}{3}; Perl automatically creates an entry for $r_mat->{2}, and hangs a hash reference off this entry. ) Thus the very act of examining an element gobbles up space, which is what we had hoped to avoid in the first place when we chose the hash of hashes representation.

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Advanced Perl Programming by Sriram Srinivasan

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