Advanced Perl Programming by Sriram Srinivasan

By Sriram Srinivasan

No matter if your wisdom of Perl is informal or deep, this publication will make you a extra entire programmer. It covers advanced recommendations for handling production-ready Perl courses and explains equipment for manipulating info and items which could have gave the impression of magic earlier than. moreover, it units Perl within the context of a bigger surroundings, giving you the heritage you wish for facing networks, databases, and GUIs. it is usually a dialogue of internals that can assist you application extra successfully and embed Perl inside C or C inside of Perl. significant issues comprise the sensible use of applications and sessions (object-oriented programming), complicated info constructions, endurance (e.g., utilizing a database), networking, graphical interfaces utilizing the Tk toolkit, interplay with interval services, embedding and lengthening the Perl interpreter, and chosen internals.

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Whenever a reference is encountered, it is also checked with a hash %already_seen to determine whether the reference has been printed before. This prevents the routine from going into an infinite loop in the presence of circular references. All functions manipulate the global variable $level and call print_indented, which appropriately indents and prints the string given to it. 5: Pretty-Printing $level = -1; # Level of indentation sub pretty_print { my $var; foreach $var (@_) { if (ref ($var)) { print_ref($var); } else { print_scalar($var); } } } sub print_scalar { ++$level; my $var = shift; print_indented ($var); --$level; } sub print_ref { my $r = shift; if (exists ($already_seen{$r})) { print_indented ("$r (Seen earlier)"); return; } else { $already_seen{$r}=1; } my $ref_type = ref($r); if ($ref_type eq "ARRAY") { print_array($r); } elsif ($ref_type eq "SCALAR") { print "Ref -> $r"; print_scalar($$r); } elsif ($ref_type eq "HASH") { print_hash($r); } elsif ($ref_type eq "REF") { ++$level; print_indented("Ref -> ($r)"); print_ref($$r); --$level; } else { print_indented ("$ref_type (not supported)"); } } sub print_array { my ($r_array) = @_; ++$level; print_indented ("[ # $r_array"); foreach $var (@$r_array) { if (ref ($var)) { print_ref($var); } else { print_scalar($var); } } print_indented ("]"); --$level; } sub print_hash { my($r_hash) = @_; my($key, $val); ++$level; print_indented ("{ # $r_hash"); while (($key, $val) = each %$r_hash) { $val = ($val ?

On the other hand, reference counting is simple to understand and implement and makes it easy to integrate Perl with C or C++ code. 8, "Resources" section at the end of the chapter for a comprehensive treatment of garbage collection techniques. Note that while symbolic references allow you to access variables in an indirect way, no actual reference variables are created. In other words, the reference count of a symbolically accessed variable is not modified. Hence symbolic references are also called soft references, in contrast to hard references, which actually allocate storage to keep track of the indirection.

This facility is reminiscent of the typeglob aliasing facility (which we'll study in Chapter 3) but bears no resemblance to Perl references. 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.

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