Delegate Literals + Immutability, pure and closures

[Don]

On 30.09.2011 02:32, dsimcha wrote:
> On 9/29/2011 5:06 PM, David Nadlinger wrote:
>> Yes, this pattern is very useful indeed, I also often use a similar
>> solution for generating code for string mixins on the fly. Do we already
>> have a name for it, by the way? I like to call it »IEDL for »Immediately
>> Executed/Evaluated Delegate Literal«, but that's probably just me.
>
> No previously chosen name that I know of, but I like your name. Anyhow,
> I'm impressed/pleasantly surprised. I didn't realize an IEDL could be
> executed at compile time to produce a mixin string. If IEDLs are that
> universally useful, then they definitely deserve some special case
> performance optimizations, i.e. inlining and avoiding heap allocations.
> Does anyone else have any interesting use cases for them?

I use them everywhere in the test suite. They behave a lot like comma 
expressions (in that they allow you to put multiple expressions in a 
place where you'd normally only be able to have one) but they allow 
statements and declarations as well as expressions. This makes them 
extremely useful in metaprogramming.