[Cfp-interest 1361] Re: Decimal FP types optional or required?

[Jim Thomas]

6.10.8.3 lists decimal floating point is a conditional feature:

__STDC_IEC_60559_DFP__ The integer constant yyyymmL, intended to indicate support of decimal
floating types and conformance to Annex F for IEC 60559 decimal floating-point
arithmetic.

- Jim

> On Jul 19, 2019, at 10:42 PM, Fred J. Tydeman <tydeman at tybor.com> wrote:
> 
> My understanding is the decimal floating-point types are required in C2X.
> However, they are not required to conform to Annex F.
> 
> If they are required, then why does 5.2.4.2.3#1 have:
> 
> An implementation that does not support decimal
> floating types shall not provide these macros.
> 
> 
> ---
> Fred J. Tydeman        Tydeman Consulting
> tydeman at tybor.com      Testing, numerics, programming
> +1 (702) 608-6093      Vice-chair of PL22.11 (ANSI "C")
> Sample C99+FPCE tests: http://www.tybor.com
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