Re: TypeInfo_Interface from runtime string?

[Thalamus via Digitalmars-d-learn]

On Wednesday, 22 June 2016 at 15:46:15 UTC, Thalamus wrote:

On Wednesday, 22 June 2016 at 15:43:08 UTC, Basile B. wrote:

On Wednesday, 22 June 2016 at 15:15:51 UTC, Thalamus wrote:

[...]


No need for a constructor. typeid() returns a static instance 
that's pre-allocated.


[...]


Thanks Basile.


Hit Send too soon...

Thanks Basile. As it turned out I was already doing something 
very similar for mapping types to interfaces and to other types, 
using shared static constructors to perform registration into 
associative arrays, e.g.


TypeInfo_Class[TypeInfo_Class]
 and
TypeInfo_Interface[TypeInfo_Class]

So I can easily add

TypeInfo_Interface[string]
 and
TypeInfo_Class[string]

as part of the existing registration process and then expose a 
simple lookup method. Thanks for the good idea! :)

Re: TypeInfo_Interface from runtime string?

[Thalamus via Digitalmars-d-learn]

On Wednesday, 22 June 2016 at 15:43:08 UTC, Basile B. wrote:

On Wednesday, 22 June 2016 at 15:15:51 UTC, Thalamus wrote:

[...]


No need for a constructor. typeid() returns a static instance 
that's pre-allocated.


[...]


Thanks Basile.

Re: TypeInfo_Interface from runtime string?

[Basile B. via Digitalmars-d-learn]

On Wednesday, 22 June 2016 at 15:15:51 UTC, Thalamus wrote:

Hi everyone,

My project includes lots of .Net interop via C linkage. One of 
the things I need to do is refer in C# to an interface declared 
in the D code, and then to actually work with the interface 
concretely in the D layer. So, I need to get a 
TypeInfo_Interface object from a string passed in from C#.


The problem isn't in marshaling the string between C# and D, 
but rather what to do with the string once I have it in D.


So in the D code, where interfaceName is the fully qualified 
name of an interface, e.g.  "MyPackage.MyModule.MyInterface", 
what I would like is something like:



TypeInfo_Interface theInterface = new 
TypeInfo_Interface(interfaceName);



But there's no such constructor.


No need for a constructor. typeid() returns a static instance 
that's pre-allocated.


Apologies if this seems like it should be obvious, but I 
couldn't find anything in the forums or the wider web. :)


No problem. What you need to do is to create a registry with all 
the possible TypeInfo_Interfaces. This registry will have the 
form of an associative array. Each TypeInfo_Interface will be 
selectable with the fully qualified string, for example:


__gshared TypeInfo_Interface[string] registry;

interface Foo{}
interface Bar{}

static this()
{
registry[typeid(Foo).toString] = typeid(Foo);
registry[typeid(Bar).toString] = typeid(Bar);
}

That's the basic idea but with introspection (foreach(member; 
traits) you should be able to automate the creation of the 
registry, in a smarter way.

TypeInfo_Interface from runtime string?

[Thalamus via Digitalmars-d-learn]

Hi everyone,

My project includes lots of .Net interop via C linkage. One of 
the things I need to do is refer in C# to an interface declared 
in the D code, and then to actually work with the interface 
concretely in the D layer. So, I need to get a TypeInfo_Interface 
object from a string passed in from C#.


The problem isn't in marshaling the string between C# and D, but 
rather what to do with the string once I have it in D.


So in the D code, where interfaceName is the fully qualified name 
of an interface, e.g.  "MyPackage.MyModule.MyInterface", what I 
would like is something like:



TypeInfo_Interface theInterface = new 
TypeInfo_Interface(interfaceName);



But there's no such constructor.

Apologies if this seems like it should be obvious, but I couldn't 
find anything in the forums or the wider web. :)


thanks,
Thalamus