1 files changed, 13 insertions, 0 deletions
diff --git a/src/main/java/org/zwobble/mammoth/internal/util/Optionals.java b/src/main/java/org/zwobble/mammoth/internal/util/Optionals.java
index d98b579..d0ca67e 100644
--- a/src/main/java/org/zwobble/mammoth/internal/util/Optionals.java
+++ b/src/main/java/org/zwobble/mammoth/internal/util/Optionals.java
@@ -1,7 +1,9 @@
 package org.zwobble.mammoth.internal.util;
 
 import java.util.Optional;
+import java.util.OptionalInt;
 import java.util.function.BiFunction;
+import java.util.function.IntFunction;
 
 public class Optionals {
     public static <T> Optional<T> first(Optional<T> first, Optional<T> second) {
@@ -35,4 +37,15 @@ public class Optionals {
             return Optional.empty();
         }
     }
+
+    public static <R> Optional<R> map(
+        OptionalInt first,
+        IntFunction<R> function)
+    {
+        if (first.isPresent()) {
+            return Optional.of(function.apply(first.getAsInt()));
+        } else {
+            return Optional.empty();
+        }
+    }
 }