From 438b7b7bd0a524e97ca30649436c1d8fec850ba3 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Fri, 16 Oct 2015 09:00:36 +0200
Subject: util/ConstBuffer: add method MoveFront()

---
 src/util/ConstBuffer.hxx | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'src/util/ConstBuffer.hxx')

diff --git a/src/util/ConstBuffer.hxx b/src/util/ConstBuffer.hxx
index 4d0a49e98..b98a8b543 100644
--- a/src/util/ConstBuffer.hxx
+++ b/src/util/ConstBuffer.hxx
@@ -246,6 +246,20 @@ struct ConstBuffer {
 		data += n;
 		size -= n;
 	}
+
+	/**
+	 * Move the front pointer to the given address, and adjust the
+	 * size attribute to retain the old end address.
+	 */
+	void MoveFront(pointer_type new_data) {
+#ifndef NDEBUG
+		assert(IsNull() == (new_data == nullptr));
+		assert(new_data <= end());
+#endif
+
+		size = end() - new_data;
+		data = new_data;
+	}
 };
 
 #endif
-- 
cgit v1.2.3