By Sriram Srinivasan
No matter if your wisdom of Perl is informal or deep, this booklet will make you a extra entire programmer. It covers advanced innovations for dealing with production-ready Perl courses and explains equipment for manipulating information and gadgets which may have seemed like magic prior to. additionally, it units Perl within the context of a bigger surroundings, giving you the heritage you wish for facing networks, databases, and GUIs. additionally it is a dialogue of internals that will help you software extra successfully and embed Perl inside C or C inside Perl. significant themes comprise the sensible use of programs and periods (object-oriented programming), complicated info constructions, patience (e.g., utilizing a database), networking, graphical interfaces utilizing the Tk toolkit, interplay with c programming language services, embedding and lengthening the Perl interpreter, and chosen internals.
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Additional resources for Advanced Perl Programming
4 Java In Java, everything is passed by reference except for fundamental types such as int and float. There are no issues of memory management, since the Java framework supports garbage collection (which runs in a separate thread so as not to freeze up the application threads). Being as rich as C++ in data types and with no memory management hassles, it holds immense promise for programming-in-the-large. 7 References in Other Languages Chapter 1 Data References and Anonymous Storage Next: 2. 8 Resources 1.
Now, $ra is a global variable that refers to the local variable $a (not the keyword local). Normally, $a would be deleted at the end of the block, but since $ra continues to refer to it, the memory allocated for $a is not thrown away. Of course, if you reassign $ra to some other value, this space is deallocated before $ra is prepared to accept the new value. You can create references to constant scalars like this: $r = \10; $rs = \"hello"; Constants are statically allocated and anonymous. A reference variable does not care to know or remember whether it points to an anonymous value or to an existing variable's value.
All this makes it very difficult to create complex data structures (and very unmaintainable if you do so). But, in all fairness, it must be stressed that Tcl is meant to be a glue language between applications and toolkits, and it is expected that most complex processing happens in the C-based application itself, rather than within the script. ). 2 Python Python is similar to Java in that, except for fundamental types, all objects are passed around by reference. This means that assigning a list-valued variable to another simply results in the second list variable being an alias of the first; if you want a copy, you have to explicitly do so and pay the corresponding price in performance.
Advanced Perl Programming by Sriram Srinivasan