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Rather than referring to a variable directly, Perl lets us refer to it by a reference a pointer to the real value stored somewhere else. There are two kinds of references in Perl: hard references, which are immutable values in the style of C++ references, and symbolic references, which are simply strings containing the name of a variable or subroutine, minus the leading punctuation. Of the two, hard references are by far the most common, and are the basis for complex data structures like arrays of arrays. Internally they are memory pointers, and we can access the value that they point to by following or dereferencing the reference. Perl provides a flexible syntax for doing this, involving the backslash and arrow operators. Conversely, symbolic references are actually banned by use strict (more accurately, use strict refs) because they are a common source of bugs due to their malleable nature and resistance to compile-time error checking by changing the contents of the string we change the thing that it points to. It is also possible to accidentally create a symbolic reference when we didn t mean to, especially if we fail to turn on warnings as well. Having made these points, symbolic references can be useful in the right places, so long as we are careful.

Hard references, usually just called references, are not really a data type but just a kind of scalar value. They differ from integer, floating-point, or string values because they are pointers to other values, and are not malleable unlike C, we cannot perform operations to change the value of a reference to make it point to something else. We can assign a new reference to a scalar variable, but that is all. Worldly programmers generally consider this a good thing.

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To create a reference for an existing value or variable, we use the backslash operator. This will convert any value or data type, be it scalar, array, hash, subroutine, and so forth, and create a scalar reference that points to it. # references to values $numberref = \42; $messageref = \"Don't Drink The Wine!"; @listofrefs = \(1, 4, 9, 16, 25); # references to variables $scalarref = \$number; $arrayref = \@array; $hashref = \%hash; $globref = \*typeglob; # typeglobs are introduced later in the chapter # reference to anonymous subroutine $subref = \sub { return "This is an anonymous subroutine" }; # reference to named subroutine $namedsubref = \&mysubroutine;

When done properly, branching is an extremely effective and efficient way of maintaining a large codebase. However, it can cause some clutter in your repository, which is why it s a good idea to have a policy about branching for your team. The typical layout for a repository has three subfolders: branches, tags, and trunk (see Figure 41-2).

If we pass a list to the backslash operator, it returns a second list of references, each one pointing to an element of the original list @reflist = \(1, 2, 3); This is identical to, but shorter than @reflist = (\1, \2, \3); We can declare a reference and initialize it to point to an empty list or hash with [] and {} my $arrayref=[]; # reference to empty array my $hashref={}; # reference to empty hash Note that both references are true because they point to something real, albeit empty References have implicit knowledge of the type of thing that they are pointing to, so an array reference is always an array reference, and we can demonstrate this by attempting to print a reference.

< php require("ClassA.php"); require("ClassB.php"); require("ClassC.php"); require("ClassD.php"); echo "Only testing require_once.";

For example, this is what we might get if we attempted to print $scalarref: SCALAR(0x8141f78) A common mistake in Perl is to try to use the backslash operator to create a reference to an existing list, but as we showed previously, this is not what backslash does In order to create an array reference from a list, we must first place the list into an array This causes Perl to allocate an array structure for the values, which we can then create a reference for the original list is not stored as an array, so it cannot be referenced This is essentially what the [..] construct does The [..] and {..} constructors also create a reference to an array or hash.

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