Finding class template instantiations via runtime reflection (for openmethods)
b4s1L3
b2.temp at gmx.com
Tue Sep 26 04:55:46 UTC 2017
On Thursday, 21 September 2017 at 20:32:38 UTC, Jean-Louis Leroy
wrote:
> It did not take long! Someone tried to create templatized open
> methods and it didn't work right of the box. I expected that,
> but in fact there may be a bit of hope. You cannot have virtual
> function templates in C++ or in D because the layout of the
> vtables have to be known at compile time - but openmethods
> creates its method tables at runtime so maybe it can be made to
> work.
>
> I stumbled upon a problem very quickly: it seems that classes
> that come from class template instantiations are not registered
> in ModuleInfo - see below,
>
> [...]
>
> Neither 'Bar!int' nor 'BarInt' appear in 'localClasses'.
>
> Ideas?
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);
}
---
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