Inspecting __traits(isDeprecated) and deprecation warnings

[Tobias Pankrath]

On Tuesday, 24 September 2019 at 17:01:46 UTC, Anonymouse wrote:
> I want to write a piece of code that reflects on the names of 
> members of a passed struct, where some are depreacted.
>
> https://run.dlang.io/is/P9EtRG
>
> struct Foo
> {
>     string s;
>     int ii;
>     bool bbb;
>
>     deprecated("Use `s`")
>     string zzzz;
> }
>
> template longestMemberLength(T)
> {
>     enum longestMemberLength = ()
>     {
>         size_t maxLength;
>
>         foreach (immutable i, immutable name; 
> __traits(allMembers, T))
>         {
>             static if (!__traits(isDeprecated, 
> __traits(getMember, T, name)))
>             {
>                 maxLength = max(maxLength, name.length);
>             }
>         }
>
>         return maxLength;
>     }();
> }
>
> static assert (longestMemberLength!Foo == "bbb".length);
>
>> onlineapp.d(23): Deprecation: variable `onlineapp.Foo.zzzz` is 
>> deprecated - Use s
>
> Is there any way to inspect the deprecated-ness of a member 
> this way? I only have what __traits(allMembers) gives me.

Does your code work or does it not? I don't seem to unterstand 
neither what the question here is nor what the desired result is. 
Is the problem that the static reflections triggers the 
deprecation warning?