Talk on D at DORS/CLUC

[Hipreme]

On Friday, 10 May 2024 at 08:43:14 UTC, RazvanN wrote:
> Hello everyone,
>
> Next week I'm going to have a talk on D at an open source 
> conference in Zagrab [1].
> This is a great opportunity to advertise D so I'm going to talk 
> about D's strength's. However, the talk is only 30 minutes in 
> length and there's a lot of things I could potentially touch on 
> - templates, dynamic arrays, safety, C interoperability etc. 
> What do you think that I should focus my talk on? Any 
> suggestions or cool D snippets are welcome.
>
> Regards,
> RazvanN
>
> [1] https://www.dorscluc.org/

I have some cool features which is quite hard to see in other 
languages:

```d
     module hip.systems.input;
         import hip.jni.jni;
         import hip.jni.helper.jnicall;

         ///Setups an Android Package for HipremeEngine
         alias HipAndroidInput = 
javaGetPackage!("com.hipremeengine.app.HipInput");
         alias HipAndroidRenderer = 
javaGetPackage!("com.hipremeengine.app.Hip_GLES30_Renderer");

         @JavaFunc!(HipAndroidInput) void 
onMotionEventActionMove(int pointerId, float x, float y)
     	{
             HipEventQueue.post(0, 
HipEventQueue.EventType.touchMove, 
HipEventQueue.Touch(cast(ushort)pointerId, x,y));
     	}

         @JavaFunc!(HipAndroidInput) void 
onMotionEventActionPointerDown(int pointerId, float x, float y)
     	{
             HipEventQueue.post(0, 
HipEventQueue.EventType.touchDown, 
HipEventQueue.Touch(cast(ushort)pointerId, x,y));
     	}

mixin javaGenerateModuleMethodsForPackage!(HipAndroidInput, 
hip.systems.input);
```

This code exposes functions on Java/Android, they iterate the 
current module, looking for `@JavaFunc` (I could have written 
ExternJava). They will generate based on the java package:

```d
     // file com/hipremeengine/app/HipInput.java
     public static class HipInput
     {
         public static native void onMotionEventActionMove(int 
pointerId, float x, float y);
         public static native void 
onMotionEventActionPointerDown(int pointerId, float x, float y);

}
```

Not only that, but you can also pretty easily call Java functions 
from D:

```d

         alias HipAndroid = 
javaGetPackage!("com.hipremeengine.app.HipremeEngine");
         int[2] wsize = HipAndroid.javaCall!(int[2], 
"getWindowSize");
         AAssetManager* aaMgr = 
cast(AAssetManager*)HipAndroid.javaCall!(Object, 
"getAssetManager");

```

Beyond that, I have also written code that auto translates to Lua 
and Objective-C. So D is quite flexible into that.

The main 2 packages I know from dub that does that are:

1. arsd.jni
2. objc_meta