Simple bitfield utility

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