How about a Hash template?

[Andrej Mitrovic]

You seem to be right. It looks like DMD is pretty good at optimizing
if statements. The Hash version is quite a bit slower actually.

Well, that's what happens when I assume things. :)

Here's a little benchmark of searching an array and hash of randomly
generated strings:
http://pastebin.com/GddUn3e3

On my system (in milliseconds):
Length: 128

Hash  Foreach: 334
Array Foreach: 61

Hash  Lookup:  6
Array Lookup:  31

I guess what I was really looking for is syntax sugar that expands this:
if (variable in value1, value2, value3, value4)

into this:
if (variable == value1 || variable == value2...)

or something of that sort. Otherwise my Hash/hash functions are pretty
useless. Sorry for not researching before opening the topic.