meta: initial commit (archival)

src/main.rs

@@ -0,0 +1,60 @@
+#[derive(Clone, Debug)]
+struct Context {
+    id: i32,
+    param: String,
+}
+
+trait FromSourceRef<Source> {
+    fn from_source_ref(source: &Source) -> Self;
+}
+
+struct Id(pub i32);
+impl FromSourceRef<Context> for Id {
+    fn from_source_ref(context: &Context) -> Self {
+        Id(context.id)
+    }
+}
+
+struct Param(pub String);
+impl FromSourceRef<Context> for Param {
+    fn from_source_ref(context: &Context) -> Self {
+        Param(context.param.clone())
+    }
+}
+
+fn print_id(Id(id): Id) {
+    println!("id is {id}");
+}
+
+fn print_all(Param(param): Param, Id(id): Id) {
+    println!("id is {id} and param is {param}")
+}
+
+trait MagicFunction<T, C> {
+    fn call(self, context: C);
+}
+
+impl<F: Fn(T), T: FromSourceRef<C>, C> MagicFunction<(T,), C> for F {
+    fn call(self, context: C) {
+        (self)(T::from_source_ref(&context))
+    }
+}
+impl<F: Fn(T1, T2), T1: FromSourceRef<C>, T2: FromSourceRef<C>, C> MagicFunction<(T1, T2), C> for F {
+    fn call(self, context: C) {
+        (self)(T1::from_source_ref(&context), T2::from_source_ref(&context))
+    }
+}
+
+fn trigger<T, C>(function: impl MagicFunction<T, C>, context: C) {
+    function.call(context)
+}
+
+fn main() {
+    let context = Context {
+        id: 82137,
+        param: "bruh".into(),
+    };
+
+    trigger(print_id, context.clone());
+    trigger(print_all, context.clone());
+}