Re: [hackers] [libgrapheme] Refine types (uint8_t -> char, uint32_t -> uint_least32_t) || Laslo Hunhold

From: Michael Forney <mforney_AT_mforney.org>
Date: Sat, 11 Dec 2021 15:33:12 -0800

On 2021-12-11, Michael Forney <mforney_AT_mforney.org> wrote:
> Conversion of unsigned char values outside the range of char is
> implementation defined by C99 6.3.1.3p3:
>
>> Otherwise, the new type is signed and the value cannot be represented
>> in it; either the result is implementation-defined or an
>> implementation-defined signal is raised.

Also worth noting, this clause still remains even in the current C23
draft, which requires two's complement. So, assuming that CHAR_MAX ==
127, (char)0xFD will continue to be implementation defined and might
raise a signal. This is different from C++, which went a step further
to define conversion between all integer types to be the unique value
congruent to 2^N (where N is the number of bits of the destination
type).
Received on Sun Dec 12 2021 - 00:33:12 CET