Proposal to add 'Elements of Programming' Concepts to std.traits

[Guillaume Chatelet]

On 06/18/12 04:18, Andrei Alexandrescu wrote:
> I think traits are something that we could add piecemeal, without a
> large proposal - just as pull requests. For each particular concept
> there should be 1-2 compelling examples in the documentation, enough to
> make a case that the notion being added is worthwhile.
> 
> For a simple example I'd like "arity" (I'm unclear whether it belongs in
> std.traits or std.functional). Sure, I could write
> ParameterTypeTuple!fun.length, but that's quite a roundabout way to go
> about it.
> 
> 
> Andrei

So here it is. A first very small patch to add arity to std.traits.

As you stated it could really go either in std.traits or std.functional.
I chose to keep it in std.traits because std.functional is more about
creating new functions of modifying existing ones whereas std.traits is
about deducing properties.

Guillaume