From 89ac111853eb4bae2fc358087c4c4657939321c0 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Sat, 15 Mar 2014 23:11:13 +0100
Subject: util/CircularBuffer: add method GetSize()

---
 src/util/CircularBuffer.hxx | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'src')

diff --git a/src/util/CircularBuffer.hxx b/src/util/CircularBuffer.hxx
index 67b60e198..0321b91f6 100644
--- a/src/util/CircularBuffer.hxx
+++ b/src/util/CircularBuffer.hxx
@@ -98,6 +98,15 @@ public:
 		return Next(tail) == head;
 	}
 
+	/**
+	 * Returns the number of elements stored in this buffer.
+	 */
+	constexpr size_type GetSize() const {
+		return head <= tail
+			? tail - head
+			: capacity - head + tail;
+	}
+
 	/**
 	 * Prepares writing.  Returns a buffer range which may be written.
 	 * When you are finished, call Append().
-- 
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