Fake Abstract classes in Rust

abstractclasstest/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "abstractclasstest"
+version = "0.1.0"

abstractclasstest/Cargo.toml

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+[package]
+name = "abstractclasstest"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

abstractclasstest/README.md

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+# AbstractClassTest
+
+Trying to do something akin to an abstract class in Rust.

abstractclasstest/src/main.rs

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+trait Base {
+    fn files(&self) -> Vec<String>;
+    fn show_files(&self) {
+        for file in self.files() {
+            println!("file={file}");
+        }
+    }
+}
+
+struct UpcaseFiles {}
+impl Base for UpcaseFiles {
+    fn files(&self) -> Vec<String> {
+        vec!["HELLO".into(), "WORLD".into()]
+    }
+}
+
+struct LowcaseFiles {}
+impl Base for LowcaseFiles {
+    fn files(&self) -> Vec<String> {
+        vec!["hello".into(), "world".into()]
+    }
+}
+
+fn main() {
+    let f1 = UpcaseFiles {};
+    f1.show_files();
+
+    let f2 = LowcaseFiles {};
+    f2.show_files()
+}