Question about __treats

[Suliman via Digitalmars-d-learn]

On Wednesday, 21 September 2016 at 07:09:01 UTC, rikki cattermole 
wrote:
> On 21/09/2016 7:06 PM, Suliman wrote:
>> It's seems that __treats is language keyword that help to get 
>> info from
>> compile-time. But there is also lib named std.traits
>>
>> and I can't understand difference
>>
>> https://dlang.org/spec/traits.html
>> https://dlang.org/phobos/std_traits.html
>>
>> Could you explain the difference?
>
> Simple, __traits or __treats as you called it is implemented by 
> the compiler.
> But std.traits is all implemented in the standard library as 
> user D code.
>
> If you can do it with std.traits you should. Otherwise __traits.
> So std.traits is a bit higher level and there are more things 
> available there as adding more __traits is a bit rare.

So for example to get All Members of class I should use 
allMembers from __traits, because it's seems that std.traits do 
not have such future.