1 files changed, 18 insertions, 2 deletions
diff --git a/src/3rdparty/angle/src/common/Optional.h b/src/3rdparty/angle/src/common/Optional.h
index 9665b7ddf6..256f38f329 100644
--- a/src/3rdparty/angle/src/common/Optional.h
+++ b/src/3rdparty/angle/src/common/Optional.h
@@ -35,11 +35,27 @@ struct Optional
         return *this;
     }
 
-    static Optional None()
+    Optional &operator=(const T &value)
     {
-        return Optional();
+        mValue = value;
+        mValid = true;
+        return *this;
+    }
+
+    Optional &operator=(T &&value)
+    {
+        mValue = std::move(value);
+        mValid = true;
+        return *this;
     }
 
+    void reset()
+    {
+        mValid = false;
+    }
+
+    static Optional Invalid() { return Optional(); }
+
     bool valid() const { return mValid; }
     const T &value() const { return mValue; }