There are other ways of doing this, but I thought it would be fun to write a command-line xpath script in ruby using rexml. (full working example here)
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One of the more annoying aspects of writing developer documentation is that it is very easy for your code examples to get out of date, develop typos, etc(As those reading previous articles may have noticed). In this article I use docbook, xslt, and automake to generate code examples that are guaranteed to compile.
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I did a presentation on the spirit library in the flesh recently and was surprised to find the big sticking point was C++ functors. So I thought I’d cover the concept here.

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In the last article we covered how to define a grammar in the boost spirit library. This article will show you how to use the data parsed by the grammar with actions. The code for this example is here.
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I haven’t done a post in a while, but I thought the boost spirit library was worth an entry. Spirit provides a way of specifying and parsing a custom language grammar right inline in C++ without the need for a code generator like lex/yacc. Spirit makes it so easy to specify and use a grammar that you should never hand write even the most trivial parser again.

The full code for this example can be found here.

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Below the link, why I think you should never under any circumstances design a feature that needs a warning message by design.
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So I used ruby to convert a simple hex string into a binary file in Converting hex to Binary in 4 Languages. Today I was trying to create a mixed ascii/binary file at work and created a little Domain Specific Language that has good possibilities.

NOTE: There is an expanded version of this script here: A Better Binary File Generator DSL in Ruby
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The venerable C switch statement keeps showing up in other languages presumably because the people who write new languages are familiar with C and don’t really think about it.
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This isn’t strictly computer engineering, but at least it is math. Today, 3/14, is PI Day!. Enjoy.