bjoernager/rust
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Transmute between big endian s6_addr and [u16; 8].

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The old code already made the assumption to reinterpret
`Ipv6Addr` as `[u16; 8]`.

Glibc, Linux, FreeBSD, Win32 all makes this assumption.
The main motivation of using union it to better optimize code.

ref:
* https://docs.microsoft.com/en-us/windows/win32/api/in6addr/ns-in6addr-in6_addr
* 1d6e424741/contrib/ntp/lib/isc/include/isc/ipv6.h (L63)
* 8b531aa996/include/net/net_ip.h (L137)
* https://sourceware.org/git/?p=glibc.git;a=blob;f=inet/netinet/in.h;h=f6355c7efe5192b88337b136ef687fe9a5ed648c;hb=HEAD#l216

Co-authored-by: Josh Stone <cuviper@gmail.com>
Co-authored-by: Peter Atashian <retep998@gmail.com>
This commit is contained in:
Lzu Tao 2020-08-05 10:29:38 +00:00
parent f5fef3c715
commit 0210fd3d73
2 changed files with 28 additions and 27 deletions
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1
library/std/src/lib.rs
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@ -249,6 +249,7 @@
#![feature(clamp)]
#![feature(concat_idents)]
#![feature(const_cstr_unchecked)]
#![feature(const_fn_transmute)]
#![feature(const_raw_ptr_deref)]
#![feature(container_error_extra)]
#![feature(core_intrinsics)]