On Saturday, 10 August 2019 at 17:45:43 UTC, Prateek Nayak wrote:
A nested function can be passed to another function evident
from this example: https://run.dlang.io/is/6waRkB
However if the nested function is a template function, it
raises an error
https://run.dlang.io/is/PQhkwl
The error being: cannot get frame pointer to the nested function
Is there a way to pass a nested template function to a function
declared outside the outer function scope?
This looks like it could be a bug to me. If you explicitly
instantiate the nested template and call dispatch like
dispatch!(nested!0) then it works.
An alias template parameter can accept both a template and an
instantiated template. I.e.
template X(T) {}
alias A = X; // ok
alias B = X!int; // ok
So it's unclear what should happen. At the least, the defaulted
argument should be applied at the call site (Func(a)).
Note though that neither versions will work on ldc or gdc
however. Because there's a bug [0] that has only been fixed in
for dmd.
[0] https://github.com/dlang/dmd/pull/9282
