Re: GCC Decimal128 class

[Jonathan Wakely <jwakely.gcc@gmail.com>]

On Tue, 23 Jan 2024 at 14:16, Jonathan Wakely <jwakely.gcc@gmail.com> wrote:
>
> On Tue, 23 Jan 2024 at 02:01, Ming Cheng via Gcc <gcc@gcc.gnu.org> wrote:
> >
> > Hi GCC,
> >
> > Seems Janis is not at IBM. Wondering someone from GCC can help my question?
> >
> > Thanks
> > Ming.
> >
> > From: Ming Cheng
> > Sent: Monday, January 22, 2024 3:18 PM
> > To: janis187@us.ibm.com
> > Subject: GCC Decimal128 class
> >
> > Hi Janis Johnson,
> >
> > I want to test GCC Decimal128 class.
> >
> > This is my code:
> >
> > #include <stdio.h>
> > #include <cstdlib>
> > #include <vector>
> > #include <algorithm>
> > #include <ctime>
> > #include <random>
> > #include <string>
> > #include <fstream>
> > #include <fenv.h>
> > #include "decimal/decimal.h"
> >
> > int main (void)
> > {
> >     std::decimal::decimal128 d128{};
> >     return 0;
> > }
> >
> > When I compile by c++23 (/opt/rh/gcc-toolset-13/root/bin/g++ -rdynamic -std=c++23  -O2 ......)
> > I got this error:
> >
> > /opt/rh/gcc-toolset-13/root/usr/include/c++/13/decimal/decimal.h:46:10: error: 'decimal32' does not name a type
> >    46 |   inline decimal32::decimal32(decimal64 __r)    : __val(__r.__getval()) {}
> >
> > I checked /opt/rh/gcc-toolset-13/root/usr/include/c++/13/decimal/decimal.h and found this comments:
> >
> > /** @file decimal/decimal.h
> > *  This is an internal header file, included by other library headers.
> > *  Do not attempt to use it directly. @headername{decimal}
> > */
> >
> > Wondering whether you can give some advice?
>
>
> Like it says, you don't include <decimal/decimal.h>
>
> You want <decimal/decimal> instead. That works fine.

This is documented at:
https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_headers.html#table.decfp_headers