[Swan-dev] pluto: sprinkle const on many struct fd * parameters

[Andrew Cagney]

On Thu, 20 Feb 2020 at 15:59, D. Hugh Redelmeier <hugh at mimosa.com> wrote:
>
> | From: Andrew Cagney <andrew.cagney at gmail.com>

> If one declares all possible struct fd * things const, the absence of
> const highlights where references could go wrong.

Why?

> "const" generally helps a reader and a compiler understand a program
> better.

It says don't write to these non-opaque contents.

> It is good that struct fd is an opaque type.
>
> One can imagine a change to fd_read which would involve modifying the
> struct fd.  At such time, the const could be removed.  Are you
> seriously contemplating a change that requires this?

I go where the code takes me.