From: Mikko Rasa <tdb@tdb.fi>
Date: Sat, 17 Jun 2023 21:58:32 +0000 (+0300)
Subject: Add a dynamic cast function for Owned
X-Git-Url: https://git.tdb.fi/?a=commitdiff_plain;h=eaab9bb5ad98b2ef5987698cc5fc7eb7e39ee7b2;p=libs%2Fgame.git

Add a dynamic cast function for Owned
---

diff --git a/source/game/owned.h b/source/game/owned.h
index 9b9d99c..e51244d 100644
--- a/source/game/owned.h
+++ b/source/game/owned.h
@@ -18,6 +18,9 @@ class Owned: public Handle<T>
 	template<typename U>
 	friend class Owned;
 
+	template<typename R, typename S>
+	friend Owned<R> dynamic_owned_cast(Owned<S> &&);
+
 public:
 	Owned() = default;
 
@@ -141,6 +144,20 @@ void Owned<T>::destroy()
 	pool.destroy(this->ptr);
 }
 
+
+template<typename T, typename S>
+Owned<T> dynamic_owned_cast(Owned<S> &&src)
+{
+	T *ptr = dynamic_cast<T *>(src.get());
+	if(!ptr)
+		return Owned<T>();
+
+	Owned<T> result;
+	result.ptr = ptr;
+	src.ptr = nullptr;
+	return result;
+}
+
 } // namespace Msp::Game
 
 #endif