A real double metaphone implementation in C++

I’ve been doing some work on a baby name explorer web app, and I needed a good C++ implementation of the double metaphone algorithm. There are several C and C++ implementations mentioned on the web site, but most of them are chock full of usage-specific junk, like Perl strings, Microsoft Visual Studio cruft, etc. So, I took the C implementation from the Perl module, removed all the perl string code, and replaced in with STL strings.

It works great, and I’m on my way to a proper baby name explorer web app. Here’s the derivative C++ double-metaphone implementation.