String Metaprogramming

[anonymous via Digitalmars-d-learn]

On Saturday, 18 July 2015 at 16:18:30 UTC, Clayton wrote:
> Thanks , you were right . It seems there are some key words 
> though which one has to use so that the code gets executed on 
> compile-time .For example I had to change the second forloop to 
> a foreach loop,

`for` loops work just fine in CTFE. `foreach` is usually nicer, 
though (regardless of CTFE or not).

> and then put and enum to ensure that TableFromCompiler gets 
> evaluated at compiletime. Having written the code this way 
> though gives rise to some other question, D supports 2 
> approches to compiletime metaprogramming i.e. CTFE and 
> Templates, it seems am not very sure which paradigm my code 
> falls in.

Your computeAtCompileTime is a template that results in a 
function when instantiated. You're calling such a generated 
function and you're assigning the result to an enum, which makes 
it a CTFE call.

So there's both CTFE and a template in your code.

You could probably do the whole pre-computation without CTFE, 
using only templates. But (here) CTFE is more straight forward as 
you can just write normal run time D.