Data commit

Task/Extend-your-language/D/extend-your-language.d

@@ -0,0 +1,32 @@
+void if2(T1, T2, T3, T4)(in bool c1, in bool c2,
+                         lazy T1 first,
+                         lazy T2 both,
+                         lazy T3 second,
+                         lazy T4 none) {
+    if (c1) {
+        if (c2)
+            both;
+        else
+            first;
+    } else {
+        if (c2)
+            second;
+        else
+            none;
+    }
+}
+
+void test(in bool a, in bool b) {
+    import std.stdio;
+    if2(a, b, writeln("first"),
+              writeln("both"),
+              writeln("second"),
+              writeln("none"));
+}
+
+void main() {
+    test(1 < 2, 3 > 4);
+    test(1 < 2, 1 < 2);
+    test(3 > 4, 3 > 4);
+    test(3 > 4, 1 < 2);
+}