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Compiling on macOS ARM64 with LDC 1.32.0 yields this error:
d-metal-binding/source/objc/runtime.d(10,12): Error: Internal compiler error: Type 'Expression' not implemented: 'class'
Possibly a compiler bug?

Although it does compile and produces a static binary, I'm not really sure how to use the hello_triangle example, or what the main() function I need to write to use it would look like. I've written the equivalent in Objective-C, but that uses NSApplication, NSWindow etc which aren't included in this binding. Can this be documented or added to the examples?

Thank you!

When compiling the following small example, linking to SDL2 and d-metal-binding, a linker error is thrown that _objc_msgSend_stret is undefined.

import std.stdio;
import std.exception;
import bindbc.sdl;
import metal;
import objc.runtime;
import objc.meta;

void main() {

 // Init SDL2
 auto load = loadSDL();
 enforce(load != SDLSupport.noLibrary, "SDL2 not found!");
 SDL_Init(SDL_INIT_VIDEO);

 SDL_Window* window = SDL_CreateWindow("Metal Test", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 480, SDL_WINDOW_METAL | SDL_WINDOW_ALLOW_HIGHDPI);
 SDL_MetalView view = SDL_Metal_CreateView(window);
 CAMetalLayer layer = cast(CAMetalLayer)SDL_Metal_GetLayer(view);
 writeln(layer.drawableSize());
 

 writeln("Edit source/app.d to start your project.");
}

Relevant output from dub

ld: Undefined symbols:
  _objc_msgSend_stret, referenced from:
      CAMetalLayer::drawableSize() in libmetal.a[12](objc.metal_gen.o)
clang: error: linker command failed with exit code 1 (use -v to see invocation)

A large part of the API has no way to release references to the classes created, this in my testing can result in some memory leaks.
A lower class than Object should probably be added, which provides just an interface to retain, release, autorelease and retainCount