From 6b8b3d8c6ed54534ac553bc81c124ea629be5def Mon Sep 17 00:00:00 2001
From: andreakarasho <andrea-angelini@outlook.it>
Date: Mon, 27 Jan 2025 01:13:58 +0100
Subject: [PATCH] use TQueryData for single()

---
 src/Bevy.cs | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/src/Bevy.cs b/src/Bevy.cs
index 43bdce7..a6dfc12 100644
--- a/src/Bevy.cs
+++ b/src/Bevy.cs
@@ -417,11 +417,14 @@ public static ISystemParam<World> Generate(World arg)
 
 	public TQueryData Iter(EcsID id) => TQueryData.CreateIterator(_query.Iter(id));
 
-	public ref T Single<T>() where T : struct
-		=> ref _query.Single<T>();
-
-	public EntityView Single()
-		=> _query.Single();
+	public TQueryData Single()
+	{
+		EcsAssert.Panic(_query.Count() == 1, "'Single' must match one and only one entity.");
+		var enumerator = GetEnumerator();
+		var ok = enumerator.MoveNext();
+		EcsAssert.Panic(ok, "'Single' is not matching any entity.");
+		return enumerator;
+	}
 
 	public int Count()
 		=> _query.Count();