Regal: An SQL relational algebra builder

[Dylan Knutson via Digitalmars-d-announce]

On Friday, 16 May 2014 at 13:42:30 UTC, Jacob Carlborg wrote:
> On 16/05/14 09:58, Dylan Knutson wrote:
>
>> Ya know, it might be able to be made into a struct; I'll 
>> fiddle with it
>> tomorrow. The main reason it was made a class was so .join had 
>> to take a
>> Table type as its first parameter, and internally Table 
>> implements a
>> Joinable interface (which is needed for chaining .joins and 
>> propagating
>> the table name during printing).
>
> Can you do compile time introspection, like ranges do? 
> Basically check if it has a "join" method.
>

I've played around with making things structs a bit more, and 
have modified regal to have Table and Sql be structs (by having 
Sql and the generic Node class wrapped in a tagged union). Making 
Table a struct was just a matter of putting some common methods 
in a template mixin, and mixin'ing that where appropriate.

New version is at ~master on github and code.dlang.org