June 2018 Update

Task/Inheritance-Multiple/D/inheritance-multiple-2.d

@@ -0,0 +1,12 @@
+interface Camera {
+    // A virtual function.
+    Image takePhoto();
+
+    // A non-virtual function.
+    final Image[] takeSeveralPhotos(int count) {
+        auto result = new Image[count];
+        foreach (ref img; result) {
+            img = takePhoto();
+        }
+    }
+}

Task/Inheritance-Multiple/D/inheritance-multiple-3.d

@@ -0,0 +1,38 @@
+class A {
+    string foo() {
+        return "I am an A.";
+    }
+}
+class B {
+    string foo() {
+        return "I am a B.";
+    }
+}
+
+class C : A {
+    string className = "C";
+    override string foo() {
+        return "I am a "~className~", and thus an A.";
+    }
+    @property
+    BWrapper asB() {
+        return new BWrapper();
+    }
+    alias asB this;
+    class BWrapper : B {
+        override string foo() {
+            return "I am a "~className~", disguised as a B.";
+        }
+    }
+}
+
+unittest {
+    import std.stdio : writeln;
+
+    auto c = new C();
+    A a = c;
+    B b = c;
+
+    writeln(a.foo());
+    writeln(b.foo());
+}

Task/Inheritance-Multiple/D/inheritance-multiple-4.d

@@ -0,0 +1,19 @@
+template registerable() {
+    void register() { /* implementation */ }
+}
+
+string makeFunction(string s) {
+    return `string `~s~`(){ return "`~s~`";}`;
+}
+
+class Foo {
+    mixin registerable!();
+    mixin(makeFunction("myFunction"));
+}
+
+unittest {
+    import std.stdio : writeln;
+    Foo foo = new Foo;
+    foo.register();
+    writeln(foo.myFunction());
+}