From f8da8b02615bc5b8a358407da147c97debc40e06 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Mon, 14 Jul 2014 16:02:02 +0200
Subject: util/Cast: add const overloads

---
 src/util/Cast.hxx | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/util/Cast.hxx b/src/util/Cast.hxx
index ca4b62832..8eb3479b8 100644
--- a/src/util/Cast.hxx
+++ b/src/util/Cast.hxx
@@ -41,6 +41,15 @@ OffsetPointer(void *p, ptrdiff_t offset)
 	return (char *)p + offset;
 }
 
+/**
+ * Offset the given pointer by the specified number of bytes.
+ */
+static inline constexpr const void *
+OffsetPointer(const void *p, ptrdiff_t offset)
+{
+	return (const char *)p + offset;
+}
+
 template<typename T, typename U>
 static inline constexpr T *
 OffsetCast(U *p, ptrdiff_t offset)
@@ -48,6 +57,13 @@ OffsetCast(U *p, ptrdiff_t offset)
 	return reinterpret_cast<T *>(OffsetPointer(p, offset));
 }
 
+template<typename T, typename U>
+static inline constexpr T *
+OffsetCast(const U *p, ptrdiff_t offset)
+{
+	return reinterpret_cast<const T *>(OffsetPointer(p, offset));
+}
+
 /**
  * Cast the given pointer to a struct member to its parent structure.
  */
-- 
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