How to get compatible symbol names and runtime typeid names for templated classes?

[bauss]

On Tuesday, 3 May 2022 at 09:52:56 UTC, cc wrote:
> On Tuesday, 3 May 2022 at 09:42:45 UTC, cc wrote:
>> Given a runtime typeid, how can I get the equivalent 
>> fullyQualifiedName without attempting to mangle the string 
>> myself manually?  e.g. something I can pass to 
>> `Object.factory`.
>
> Actually, looking at this further, does Object.factory even 
> support templates?  I'm getting null returned from any attempt 
> to instantiate a templated classname.

It does not.

Object.factory calls TypeInfo_Class.find which just loops through 
ModuleInfo and then looks if any of the entries in localClasses 
has a name that matches.

So for your example it does this check:

```
if (c.name == "test.Foo!(true)") {
   return c; // c is the TypeInfo_Class that matches the given 
class name
}
```

https://github.com/dlang/druntime/blob/master/src/object.d#L1661

Afterwards it calls the create function on the TypeInfo_Class 
which of course isn't "generic" by any means.

This is where compile-time has its limits compared to runtime 
type creation, because templates only live during compile-time 
then it isn't really that easy to do something like this, where 
it would be trivial in other languages like C#.