From 6f7dce6dcafaa6749eb0b994eee5e31b93822c2b Mon Sep 17 00:00:00 2001
From: Max Kellermann <mk@cm4all.com>
Date: Wed, 13 Sep 2023 09:26:02 +0200
Subject: [PATCH] test/util/TestIntrusiveForwardList: implement size() only if
 `options.constant_time_size` is set

---
 src/util/IntrusiveForwardList.hxx | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/src/util/IntrusiveForwardList.hxx b/src/util/IntrusiveForwardList.hxx
index 39055f11c..ea105b591 100644
--- a/src/util/IntrusiveForwardList.hxx
+++ b/src/util/IntrusiveForwardList.hxx
@@ -178,11 +178,9 @@ public:
 		return head.next == nullptr;
 	}
 
-	constexpr size_type size() const noexcept {
-		if constexpr (constant_time_size)
-			return counter;
-		else
-			return std::distance(begin(), end());
+	constexpr size_type size() const noexcept
+		requires(constant_time_size) {
+		return counter;
 	}
 
 	void clear() noexcept {