Download e-book for iPad: Advanced Perl Programming by Sriram Srinivasan

By Sriram Srinivasan

ISBN-10: 1565922204

ISBN-13: 9781565922204

Even if your wisdom of Perl is informal or deep, this booklet will make you a extra finished programmer. It covers advanced suggestions for dealing with production-ready Perl courses and explains equipment for manipulating facts and gadgets which may have seemed like magic earlier than. moreover, it units Perl within the context of a bigger setting, giving you the heritage you wish for facing networks, databases, and GUIs. it is also a dialogue of internals that will help you software extra successfully and embed Perl inside C or C inside Perl. significant subject matters contain the sensible use of applications and periods (object-oriented programming), advanced info constructions, endurance (e.g., utilizing a database), networking, graphical interfaces utilizing the Tk toolkit, interplay with c programming language features, embedding and lengthening the Perl interpreter, and chosen internals.

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Extra resources for Advanced Perl Programming

Sample text

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.

Since %matrix is a hash, they can be stored as $matrix{rows} and $matrix{cols}. Because hash indices are strings, this approach is efficient only if the matrix is large and sparse. 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.

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. Fortunately, there's a way to switch this eagerness off. Perl has a number of compile-time directives, or pragmas. The strict pragma tells Perl to do strict error checking. pl line 3 The strict directive remains in effect until the end of the block. It can be turned off by saying no strict or, more specifically, no strict 'refs'.

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Advanced Perl Programming by Sriram Srinivasan

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