endian: add an auto-converting endian type

endian.hpp

@@ -9,12 +9,15 @@
 #ifndef __UTIL_ENDIAN_HPP
 #define __UTIL_ENDIAN_HPP
 
+#include "std.hpp"
 #include "types/bits.hpp"
 
 #include <cstring>
 #include <cstdint>
 #include <type_traits>
 
+#include <iosfwd>
+
 namespace cruft {
     //-------------------------------------------------------------------------
     // CXX: Update using "if constexpr" when available. It doesn't seem to be
@@ -200,5 +203,42 @@ namespace cruft {
 
         endian::scheme src;
     };
+
+
+    namespace endian {
+        template <scheme StorageV, typename ValueT>
+        struct value {
+
+            operator ValueT () const
+            {
+                return convert<StorageV,scheme::native> (raw);
+            }
+
+            decltype(auto) operator+ () const { return +this->operator ValueT (); }
+
+            ValueT operator<< (size_t s) const { return convert<StorageV,scheme::native> (raw) << s; }
+
+            auto& operator= (ValueT const &val) { raw = convert<scheme::native,StorageV> (val); return *this; }
+
+            ValueT raw;
+        };
+
+
+        template <typename ValueT> using little = value<scheme::little,ValueT>;
+        template <typename ValueT> using big    = value<scheme::big   ,ValueT>;
+
+
+        template <scheme StorageV, typename ValueT>
+        std::ostream&
+        operator<< (std::ostream &os, value<StorageV,ValueT> const &val)
+        {
+            return os << +ValueT(val);
+        }
+    }
+
+    using bu16 = endian::big<u16>;
+    using bu32 = endian::big<u32>;
 }
+
+
 #endif