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Re: c99 support
From: |
Hans Åberg |
Subject: |
Re: c99 support |
Date: |
Fri, 29 Jun 2018 12:34:07 +0200 |
> On 29 Jun 2018, at 12:10, Chris Vine <address@hidden> wrote:
>
>> For C++, these are only optional, cf. [1], as they require no padding. So an
>> alternative is to typedef the obligatory int_fast<2^k>_t types, perhaps
>> leaving the API unchanged.
>>
>> 1. https://en.cppreference.com/w/cpp/types/integer
>
> The fixed size integer types are optional in C99/11 also, depending on
> whether the platform provides a fixed size integer of the type in
> question without padding and (for negative integers) a two's complement
> representation.
Yes, I saw that, too. It is important to ensure two's complement, too, which
the other types do not.
> If, say, uint8_t is available in stdint.h for C, it
> will be available for C++. §21.4.1/2 of C++17 makes this even more
> explicit: "The [cstdint] header defines all types and macros the
> same as the C standard library header <stdint.h>".
Which C version? In g++7, __STDC_VERSION__ is not defined, only __STDC__.
> I imagine guile will not run on any platform that does not support 8
> and 32 bit fixed size integers.
I would think all CPUs support those types nowadays, so it is rather
theoretical.