From 0b489b012306b727145a678acb8ac37a206a093d Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sat, 14 Feb 2026 12:25:55 +0000
Subject: Fix initialising new entries in glContainer::resize

---
 lib/glContainer.h | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

(limited to 'lib')

diff --git a/lib/glContainer.h b/lib/glContainer.h
index 5cbb038..4119ef5 100644
--- a/lib/glContainer.h
+++ b/lib/glContainer.h
@@ -298,12 +298,11 @@ public:
 			allocBuffer(newSize);
 			mapForAdd();
 		}
-		if (newSize > size_) {
-			for (auto & uninitialised : mkspan().subspan(size_, newSize - size_)) {
+		if (const auto prevSize = setSize(newSize); newSize > prevSize) {
+			for (auto & uninitialised : mkspan().subspan(prevSize, newSize - prevSize)) {
 				new (&uninitialised) T {};
 			}
 		}
-		setSize(newSize);
 	}
 
 	void
@@ -423,10 +422,10 @@ public:
 	}
 
 protected:
-	void
+	size_type
 	setSize(size_type s)
 	{
-		size_ = s;
+		return std::exchange(size_, s);
 	}
 
 	void
-- 
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