Finding class template instantiations via runtime reflection (for openmethods)

[Jean-Louis Leroy]

On Tuesday, 26 September 2017 at 04:55:46 UTC, b4s1L3 wrote:
> On Thursday, 21 September 2017 at 20:32:38 UTC, Jean-Louis 
> Leroy wrote:
>> [...]
>
> Yeah. You can setup a custom registry that maps names to their 
> TypeInfo_Class.
> I do something similar in iz (though the real point in iz is a 
> GC-free factory but the principle of the registry would be the 
> the same for you)
>
> Example:
>
> ---
> /+ dub.sdl:
>    name "dub_script"
>    dependency "iz" version="0.6.0"
> +/
> module dub_script;
>
> import iz.memory, std.stdio;
>
> class Foo(T){this(){writeln("fooDeInt");}}
> TypeInfo_Class[string] registry; // you need that...
>
> static this()
> {
>     registerFactoryClass!(Foo!int)(registry); // ...and that, 
> maybe  with another name
> }
>
> void main()
> {
>     auto fooDeInt = iz.memory.factory(registry, "Foo!int");
>     destruct(cast(Object) fooDeInt);
> }
> ---

Yeah that's what I implemented yesterday (not pushed yet).

I have a prototype of a solution for using open methods and 
templates together - although the syntax is not light: it 
requires guidance from the user (a la C++ explicit template 
instantiation).