From fa65bbf217b725ada35107b4ad646d250228355c Mon Sep 17 00:00:00 2001
From: MarcoFalke <falke.marco@gmail.com>
Date: Sun, 2 Jan 2022 11:19:01 +0100
Subject: span: Add BytePtr helper

---
 src/span.h | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/span.h b/src/span.h
index 47390a5bb2..b627b993c2 100644
--- a/src/span.h
+++ b/src/span.h
@@ -243,16 +243,21 @@ T& SpanPopBack(Span<T>& span)
     return back;
 }
 
+//! Convert a data pointer to a std::byte data pointer.
+//! Where possible, please use the safer AsBytes helpers.
+inline const std::byte* BytePtr(const void* data) { return reinterpret_cast<const std::byte*>(data); }
+inline std::byte* BytePtr(void* data) { return reinterpret_cast<std::byte*>(data); }
+
 // From C++20 as_bytes and as_writeable_bytes
 template <typename T>
 Span<const std::byte> AsBytes(Span<T> s) noexcept
 {
-    return {reinterpret_cast<const std::byte*>(s.data()), s.size_bytes()};
+    return {BytePtr(s.data()), s.size_bytes()};
 }
 template <typename T>
 Span<std::byte> AsWritableBytes(Span<T> s) noexcept
 {
-    return {reinterpret_cast<std::byte*>(s.data()), s.size_bytes()};
+    return {BytePtr(s.data()), s.size_bytes()};
 }
 
 template <typename V>
-- 
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