getOpt with shared
Danny Arends
Danny.Arends at gmail.com
Fri May 11 17:36:34 UTC 2018
On Friday, 11 May 2018 at 17:25:44 UTC, Danny Arends wrote:
> Hey all,
>
> I have been working on creating a multi-threaded application,
> so I have a shared configuration object which hold several
> command line parameters (which I fill using getopt).
>
> The problem is that I get deprecation warnings when trying to
> set numerical values:
>
> /usr/include/dmd/phobos/std/getopt.d(895,36): Deprecation:
> read-modify-write operations are not allowed for shared
> variables. Use core.atomic.atomicOp!"+="(*receiver, 1) instead.
>
> using getopt with a shared object and boolean values seems
> completely broken:
>
> /usr/include/dmd/phobos/std/getopt.d(895,34): Error: operation
> not allowed on bool *receiver += 1
> /usr/include/dmd/phobos/std/getopt.d(751,46): Error: template
> instance `std.getopt.handleOption!(shared(bool)*)` error
> instantiating
> /usr/include/dmd/phobos/std/getopt.d(435,15): 6
> recursive instantiations from here: getoptImpl!(string,
> shared(string)*, string, shared(string)*, string,
> shared(VSync)*, string, shared(ulong)*, string, shared(bool)*,
> string, shared(Verbose)*)
>
> Is getopt not supposed to be used with shared structs ?
small example:
import std.getopt : getopt;
struct Settings {
size_t myvalue = 0;
}
shared(Settings) config;
int main(string[] args) {
getopt(args, "m|myvalue", &(config.myvalue));
return(0);
}
Changing size_t to bool, results in the compilation error
mentioned in the previous post
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