From ad2b8589338fef29a56b64de3414e645d210a020 Mon Sep 17 00:00:00 2001
From: Max Kellermann <mk@cm4all.com>
Date: Fri, 16 Aug 2019 09:57:55 +0200
Subject: [PATCH] util/ForeignFifoBuffer: add friend function swap()

---
 src/util/ForeignFifoBuffer.hxx | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/util/ForeignFifoBuffer.hxx b/src/util/ForeignFifoBuffer.hxx
index 75fbad82e..bea0c1e5f 100644
--- a/src/util/ForeignFifoBuffer.hxx
+++ b/src/util/ForeignFifoBuffer.hxx
@@ -90,6 +90,10 @@ public:
 		swap(data, other.data);
 	}
 
+	friend void swap(ForeignFifoBuffer<T> &a, ForeignFifoBuffer<T> &b) noexcept {
+		a.swap(b);
+	}
+
 	constexpr bool IsNull() const noexcept {
 		return data == nullptr;
 	}