From f41b914197595ad0fffc9dfd62159ab60135ac0f Mon Sep 17 00:00:00 2001
From: Michele Caini <michele.caini@gmail.com>
Date: Fri, 17 Mar 2023 08:45:58 +0100
Subject: [PATCH] meta: allow updating values on meta properties

---
 src/entt/meta/meta.hpp       |  8 ++++++++
 test/entt/meta/meta_prop.cpp | 13 ++++++++++++-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/src/entt/meta/meta.hpp b/src/entt/meta/meta.hpp
index 395a4a5fc..ac36ff3f2 100644
--- a/src/entt/meta/meta.hpp
+++ b/src/entt/meta/meta.hpp
@@ -763,6 +763,14 @@ struct meta_prop {
         return node->value ? node->type(internal::meta_context::from(*ctx)).from_void(*ctx, nullptr, node->value.get()) : meta_any{meta_ctx_arg, *ctx};
     }
 
+    /**
+     * @brief Returns the stored value by reference.
+     * @return A wrapper containing the value stored with the property.
+     */
+    [[nodiscard]] meta_any value() {
+        return node->value ? node->type(internal::meta_context::from(*ctx)).from_void(*ctx, node->value.get(), nullptr) : meta_any{meta_ctx_arg, *ctx};
+    }
+
     /**
      * @brief Returns true if an object is valid, false otherwise.
      * @return True if the object is valid, false otherwise.
diff --git a/test/entt/meta/meta_prop.cpp b/test/entt/meta/meta_prop.cpp
index 92071c5c8..9c90cff70 100644
--- a/test/entt/meta/meta_prop.cpp
+++ b/test/entt/meta/meta_prop.cpp
@@ -49,7 +49,18 @@ TEST_F(MetaProp, Functionalities) {
     auto prop = entt::resolve<base_1_t>().prop("int"_hs);
 
     ASSERT_TRUE(prop);
-    ASSERT_EQ(prop.value(), 42);
+
+    auto value = prop.value();
+    auto cvalue = std::as_const(prop).value();
+
+    ASSERT_NE(value.try_cast<int>(), nullptr);
+    ASSERT_EQ(cvalue.try_cast<int>(), nullptr);
+
+    ASSERT_NE(value.try_cast<const int>(), nullptr);
+    ASSERT_NE(cvalue.try_cast<const int>(), nullptr);
+
+    ASSERT_EQ(value, 42);
+    ASSERT_EQ(cvalue, 42);
 }
 
 TEST_F(MetaProp, FromBase) {