From f34b92ff36da78a963bbfb5ca1c854ab7c464857 Mon Sep 17 00:00:00 2001
From: Baptiste Wicht <baptiste.wicht@gmail.com>
Date: Sun, 11 Sep 2016 15:26:10 +0200
Subject: [PATCH] Simple bitfield utility

---
 tstl/include/bit_field.hpp | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 tstl/include/bit_field.hpp

diff --git a/tstl/include/bit_field.hpp b/tstl/include/bit_field.hpp
new file mode 100644
index 00000000..af5b9415
--- /dev/null
+++ b/tstl/include/bit_field.hpp
@@ -0,0 +1,34 @@
+//=======================================================================
+// Copyright Baptiste Wicht 2013-2016.
+// Distributed under the terms of the MIT License.
+// (See accompanying file LICENSE or copy at
+//  http://www.opensource.org/licenses/MIT)
+//=======================================================================
+
+#ifndef BITFIELD_HPP
+#define BITFIELD_HPP
+
+#include <types.hpp>
+
+namespace std {
+
+template<typename S, typename T, size_t Position, size_t Size>
+struct bit_field {
+    S* value;
+
+    bit_field(S* value) : value(value) {}
+
+    T operator*() const {
+        return (*value >> Position) & ((1ULL << Size) - 1);
+    }
+
+    bit_field& operator=(T new_value){
+        S mask = ((1ULL << Size) - 1) << Position;
+        *value = (*value & ~mask) | ((new_value << Position) & mask);
+        return *this;
+    }
+};
+
+} //end of namespace std
+
+#endif