Templated Template Value Parameters

Robin Kupper robin.kupper at rwth-aachen.de
Sun Oct 1 08:56:52 UTC 2017


I have a question regarding template value parameters.

As this works:

     template B(T, T[] foo) {}

I expected

     template A(U) {}
     template B(T, A!T foo) {}

to work, too. Currently, it failes with "undefined identifier 
`T`".

I'm not sure as why T is undefined in this case, as the first 
example works properly.

In the same vein:

     alias A(U) = int;
     template B(T, A!T u) {}

This failes to compile with "undefined identifier `T`", too.

Why is this happening?

I'm using DMD v2.076.0.


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