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There are many ways to create constant scalars in Perl, for instance, typeglob-aliasing a reference to a constant string. A constant scalar tied class is another solution to this problem. As the example that follows illustrates, the implementation is trivial if we use Tie::StdScalar we just overload STORE: package Constant::Scalar; use base Tie::StdScalar; sub STORE { die "Attempt to modify constant"; } 1; We could go on to extend this class to lock or unlock the value much as we did with the Permissions::Hash example earlier. Although it is slower than the typeglob approach, the tied constant scalar permits us to add additional functionality like this in an elegant and intuitive way.

And here are some code generator resources: CF Template: http://cftemplate.riaforge.org/ Illudium PU-36 Code Generator: http://code.google.com/p/cfcgenerator/ Rooibos (Bean Code) Generator: http://rooibos.maestropublishing.com/

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Useful though tied objects are, they do not come without caveats One drawback of a tied object class is that it is slower than the equivalent native data type A real hash is very fast in Perl, and a restricted hash is not much slower But a tied hash, array, scalar, or filehandle requires a method call for every kind of manipulation, and this will always be less efficient than the native equivalent Tied objects strive to implement the semantics of ordinary data types, but with additional intelligence However, there are a few cases where a tied object will not behave like a fundamental data type that we may need to be aware of One of the more subtle ones is that autovivification of arrays and hashes no longer works when the array or hash is actually a tied object.

With a real array or hash, we can say $array[0][1][2][3]='deep down array value'; $hash{key}{deep}{deeper}{waydown}='deep down hash value'; This will not work with a tied hash or array unless all the intermediate data structures already exist, at least currently (It may be supported beyond Perl 510) Prior to Perl 583, hashes always evaluated to a false value in scalar context, so we cannot test whether or not a tied hash has any keys with a construct like this one: if (%tied_hash) { .. # possible ERROR: always always false prior to 583 In a sufficiently modern Perl, the SCALAR method is implemented so tied hashes can provide an answer to this question Failing this, Perl checks to see if each built-in function has been called for the underlying data and has an active iterator, in which case the hash evaluates to a true value.

If each does not have an active iterator, FIRSTKEY is called and the hash evaluates to true if FIRSTKEY returns a value Since FIRSTKEY may trigger initialization code for empty tied hashes in our tied object implementation, this behavior is worth keeping in mind..

Within minutes of the first ColdFusion framework (Fusebox) being announced on CF-Talk, questions arose: Why bother What do we need a framework for Isn't it just more work The questions have not been resolved, despite the fact that Fusebox is now in its fifth iteration. So we asked Jared Rypka-Hauer to take on frameworks explain what they are and why they are useful, and delve into the differences among the many frameworks available to the ColdFusion community. I ll never forget my first experience with ColdFusion. I bought a copy of Ben Forta s now-ubiquitous WACK (Web Application Construction Kit) book at the suggestion of a friend and had the ColdFusion server installed and serving up the responses to queries within minutes. In less than three days I had a corporate text paging system up and running using the typical 5 10 ColdFusion tags and our group s Lotus Notes database. That was around 1998. Today we like to think that ColdFusion is less about simple scripts and more about real programming, yet I could still sit down with someone and have him reading data from a database and displaying master/detail pages within minutes. Our beloved language has become far more flexible and is able to cater to advanced techniques without sacrificing the simple, oldfashioned techniques we ve come to both love and hate. While we should not allow ourselves to forget that ColdFusion, at its most fundamental level, is about making complicated things easy, we shouldn t shackle ourselves, either. We need to continue discussing advanced techniques and building our skills on the programming side of things. Frameworks are a fundamental part of advanced techniques and, fortunately, the concepts behind using any given framework are portable from one language to almost any other.

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