introduce Tuple

src/main/java/org/comroid/api/func/util/Tuple.java

@@ -0,0 +1,32 @@
+package org.comroid.api.func.util;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.util.Objects;
+
+public interface Tuple {
+    @Data
+    @NoArgsConstructor
+    @AllArgsConstructor
+    class N2<A, B> implements Tuple {
+        public A a;
+        public B b;
+
+        @Override
+        public final int hashCode() {
+            return Objects.hash(a, b);
+        }
+
+        @Override
+        public final boolean equals(Object obj) {
+            return obj instanceof N2<?, ?> other && other.hashCode() == hashCode();
+        }
+
+        @Override
+        public String toString() {
+            return "( %s , %s )".formatted(a, b);
+        }
+    }
+}