This patch adds a new header file, "core/unaligned.hh", which defines a
new operation, unaligned_cast<T*>(p). This works exctly like
reinterpret_cast<T*>(p) except it is safe to use even when the address
of p is not a multiple of alignof(T).
A long comment in the header file explains why this unaligned_cast<>
is necessary on some esoteric architectures and to quiet gcc's
-fsanitize=alignment.
The header file also defines a new template for holding an unaligned
version of type - unaligned<T>. unaligned<T> is almost identical to our
existing net::packed<>, so the next patch will implement net::packed
in terms of unaligned<>.
The unaligned_cast<> and unaligned<> templates are of course generally
useful outside the network code, which is why I wanted them out of the
networking header files and namespace.
Signed-off-by: Nadav Har'El <nyh@cloudius-systems.com>
