Re: How to extract the AA type?

[jmh530 via Digitalmars-d]

On Wednesday, 13 December 2017 at 16:00:32 UTC, Steven 
Schveighoffer wrote:
A nice puzzle for those template gurus out there.

I have a function like this:
auto foo(T: V[K], V, K)(T t)
{
   RealAAType!(T, V, K) aa = t;
   return aa;
}

So I need to know what to write RealAAType. What I'm looking 
for is a mechanism to write the exact AA type that is passed 
in. RealAAType should be an AA, and nothing else.

[snip]

How about:

template RealAAType!(T, V, K)
{
    import std.traits : CopyConstness;

    alias RealAAType = CopyConstness!(T, V[K]);
}