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Re: [RFC] struct field initialization and implicit constraints


From: Jose E. Marchesi
Subject: Re: [RFC] struct field initialization and implicit constraints
Date: Mon, 12 Apr 2021 21:10:10 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

Hi.

> So, how to fix this.
>
> I see three possibilities:
>
> a) Do nothing, and document the workaround in 1).
>
> b) Add a new syntax like `:= VALUE' to mean initialization-only, and
>    keep the current semantics of `= VALUE'.
>
> c) Change the semantics of `= VALUE' to mean initialization-only, and
>    add a new syntax like `== VALUE' to always mean
>    initialization-and-implicit-constraint.
>
>    In this case, using `== VALUE' would forbid to also specify an
>    explicit constraint, i.e. this would not be permitted:
>
>      type Foo =
>        struct
>        {
>           uint<16> magic == 0xfeef : magic > 0; /* error */
>           [...]
>        };
>
> My preference at this point is c).
> Opinions?

Since there has been no feedbad in a few days I just pushed an
implementation for c) that I had ready before hand.  It is now in master
:)

Salud!



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