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It can be occasionally useful for a subroutine to know the name of the package in which it is defined. Since this is a compile-time issue (package declarations are lexical, even though they affect run time scope), we could manually copy the package name from the top of the module or whichever internal package declaration the subroutine falls under. However, this is prone to failure if the package name changes at any point. This is a more serious problem than it might at first appear because it will not necessarily lead to a syntax error. To avoid this kind of problem, we should avoid ever naming the package explicitly except in the package declaration itself. Within the code, we can instead use the special bareword token __PACKAGE__ like so: sub self_aware_sub { print "I am in the ",__PACKAGE__," package.\n"; } As a more expressive but less functional example, the following series of package declarations shows how the value produced by __PACKAGE__ changes if more than one package is present in a given file: package My::Module; print __PACKAGE__,"\n"; package My::Module::Heavy; print __PACKAGE__,"\n"; package My::Module::Light; print __PACKAGE__,"\n"; package A::Completely::Different::Package; print __PACKAGE__,"\n"; Each time the __PACKAGE__ token is printed out, Perl expands it into the current package name, producing My::Module, then My::Module::Heavy, and so on. When Perl loads and compiles a file containing this token, the interpreter first scans and substitutes the real package name for any instances of __PACKAGE__ it finds before proceeding to the compilation stage. This avoids any potential breakages if the package name should change.

In Listing 3 8, the code produces the same outcome as Listing 3 7, yet the number of function calls made is reduced from ten to one. The fewer calls made, the faster your PHP script becomes. Using the PHP function microtime(), we can determine exactly how much faster using nine fewer count() function calls is. Using the code shown in Listing 3 7, we add an additional for loop to execute the code 100,000 times, which represents 100,000 users

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The Symbol module provides subroutines for creating and manipulating variable names with respect to packages without dealing with the package name directly, notably the gensym and qualify subroutines. The gensym subroutine generates and returns a reference to a fully anonymous typeglob that is, a typeglob that does not have an entry anywhere in any symbol table. We can use the anonymous typeglob as we like, for example, as a filehandle (though IO::Handle does this better in these more

Your working copy changes end at ======= The revision that conflicted with yours is between ======= and >>>>>>> This is called a diff The second file, commonjsmine, is a copy of your file before you tried to merge it The third file, commonjsr1024, is the file as it was before you modified it The fourth file is the file as it is from the trunk In order to resolve the conflict, the original file, commonjs, needs to be changed to the proper way At this point, you can do a svn log command on the trunk to see who made this change and discuss it with them Once a decision is reached and the file is as it should be, it needs to be marked as resolved before it can be committed In our case, we want to keep the trunk changes.

enlightened days, and, as a point of fact, uses gensym underneath). It takes no arguments and just returns the reference: use Symbol; my $globref = gensym; open ($globref, $filename); ... More useful is the qualify subroutine, which provides a quick and convenient way to generate fully qualified names (and therefore symbolic references) for variables from unqualified ones. It operates on strings only, and with one argument it generates a name in the current package. For example: #!/usr/bin/perl # symbol1.pl use warnings; use Symbol; my $fqname = qualify('scalar'); $$fqname = "Hello World\n"; print $scalar; # produces 'Hello World' Since this is a simple script without a package declaration, the variable created here is actually called $main::scalar. If we supply a package name as a second argument to qualify, it places the variable into that package instead. #!/usr/bin/perl # symbol2.pl use warnings; use Symbol; my $fqname = qualify('scalar','My::Module'); $$fqname = "Hello World\n"; print $My::Module::scalar; In both cases, qualify will only modify the name of the variable passed to it if it is not already qualified. It will correctly qualify special variables and the standard filehandles like STDIN into the main package, since these variables always exist in main, wherever they are used. This makes it a safer and simpler way than trying to make sure our symbolic references are correct and in order when we are assembling them from strings. Unfortunately, qualify is not very useful if we have strict references enabled via use strict, since these are symbolic references. Instead, we can use qualify_to_ref, which takes a symbolic name and turns it into a reference for us, using the same rules as qualify to determine the package name: #!/usr/bin/perl # symbol3.pl use warnings; use strict; use Symbol; my $fqref = qualify_to_ref('scalar','My::Module'); $$fqref =\"Hello World\n"; print $My::Module::scalar;

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