From 66ba8d76cf83e0e1875f13749833d95cb831f4b9 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sat, 14 Feb 2026 12:37:53 +0000
Subject: Return indices instead of iterates from InstanceVertices::partition

More useful in the context of passing them to OpenGL.
---
 gfx/gl/instanceVertices.h | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

(limited to 'gfx')

diff --git a/gfx/gl/instanceVertices.h b/gfx/gl/instanceVertices.h
index 28e11ee..629c664 100644
--- a/gfx/gl/instanceVertices.h
+++ b/gfx/gl/instanceVertices.h
@@ -127,16 +127,22 @@ public:
 	}
 
 	template<typename Pred>
-	glContainer<T>::iterator
+	base::size_type
 	partition(Pred pred)
 	{
-		return partition(base::begin(), base::end(), pred);
+		return indexOf(partition(base::begin(), base::end(), pred));
 	}
 
 protected:
 	static constexpr auto npos = static_cast<size_t>(-1);
 	friend InstanceProxy;
 
+	base::size_type
+	indexOf(base::iterator iter)
+	{
+		return static_cast<base::size_type>(iter - base::begin());
+	}
+
 	void
 	release(const size_t pidx)
 	{
-- 
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