From 666c323577ba9b659c7bc70410831485e16490da Mon Sep 17 00:00:00 2001
From: Manuel Zahariev <manuel@duck.com>
Date: Mon, 10 Mar 2025 14:41:43 -0700
Subject: [PATCH] AK/Error: Add value_or convenience method

- In the style of Optional::value_or
- Only const& flavor
- WARNING: no unit test (no unit tests for Error), but seems benign
---
 AK/Error.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/AK/Error.h b/AK/Error.h
index 910f917bd40..b993747ff05 100644
--- a/AK/Error.h
+++ b/AK/Error.h
@@ -151,6 +151,12 @@ public:
 
     T& value() { return m_value_or_error.template get<T>(); }
     T const& value() const { return m_value_or_error.template get<T>(); }
+    [[nodiscard]] ALWAYS_INLINE T const& value_or(T const& fallback) const
+    {
+        if (is_error())
+            return fallback;
+        return m_value_or_error.template get<T>();
+    }
 
     ErrorType& error() { return m_value_or_error.template get<ErrorType>(); }
     ErrorType const& error() const { return m_value_or_error.template get<ErrorType>(); }