enums are interfaces where 1 function needs to know all impls but at least no weird box shit

src/main.rs

@@ -20,11 +20,13 @@ fn main() {
 
     // Create the synthesizer.
     let settings = SynthesizerSettings::new(params.sample_rate as i32);
-    let mut synthesizer = Synthesizer::new(&sound_font, &settings).unwrap();
+    let synthesizer = Synthesizer::new(&sound_font, &settings).unwrap();
+
+    let mut syn = Syn::Real(synthesizer);
 
     // Play some notes (middle C, E, G). // 16 channels actually // 60=c 64=e 67=g //up to 128velocity though dont go below 50 tbh // 12 notes per octave
-    synthesizer.note_on(0, 64 + 12, 127);
-    //synthesizer.render(&mut left[..], &mut right[..]); // puts in a state of rendering the first loop of these notes
+    syn.note_on(0, 64 + 12, 127);
+    //syn.render(&mut left[..], &mut right[..]); // puts in a state of rendering the first loop of these notes
 
     // The recycled output buffer per-loop, could be in lamba but that'd be wasteful
     let sample_count = (params.channel_sample_count) as usize;
@@ -33,7 +35,7 @@ fn main() {
     // Start the audio output. Executes channel_sample_count per loop, sample_rate/channel_sample_count per second forever.
     let _device = run_output_device(params, {
         move |data| {
-            synthesizer.render(&mut left[..], &mut right[..]); // put in a state of rendering the next loop of these notes
+            syn.render(&mut left[..], &mut right[..]); // put in a state of rendering the next loop of these notes
             for (i, value) in left.iter().interleave(right.iter()).enumerate() {
                 data[i] = *value;
             }
@@ -44,3 +46,27 @@ fn main() {
     // Let it ride
     std::thread::sleep(std::time::Duration::from_secs(2));
 }
+
+enum Syn {
+    Real(Synthesizer),
+}
+
+impl Syn {
+    fn note_on(&mut self, a: i32, b: i32, c: i32) {
+        match self {
+            Syn::Real(syn) => syn.note_on(a, b, c),
+        };
+    }
+
+    fn note_off(&mut self, a: i32, b: i32) {
+        match self {
+            Syn::Real(syn) => syn.note_off(a, b),
+        };
+    }
+
+    fn render(&mut self, a: &mut [f32], b: &mut [f32]) {
+        match self {
+            Syn::Real(syn) => syn.render(a, b),
+        };
+    }
+}