std.traits vcs __traits

Stefan Koch via Digitalmars-d digitalmars-d at puremagic.com
Mon Jan 16 03:54:23 PST 2017


On Sunday, 15 January 2017 at 12:53:04 UTC, Nordlöw wrote:
> Why is there both
>
> http://dlang.org/phobos/std_traits.html
>
> and the builtin
>
> https://dlang.org/spec/traits.html
>
> ?
>
> Should we modify std.traits to make use of __traits? I've 
> noticed measurably faster compilations with __traits instead of 
> std.traits for simple things such as isIntegral, isUnsigned, 
> etc.
>
> If so, I'll happily make that happen!

There is a simple reason, you don't want complicated 
type-introspection logic welded into the compiler.

The reason why std.traits it slow is because of inefficiencies 
inside the template-system, which I intend to fix.
Therefore your efforts would be wasted.


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