A Huge Bummer When Using alias this
Jack Stouffer via Digitalmars-d
digitalmars-d at puremagic.com
Thu Mar 24 14:26:00 PDT 2016
alias this is only useful when not using any function that relies
on the template constraints in std.traits.
For example
import std.traits;
void someFunc(N)(N val) if (isNumeric!N)
{
int b = val;
}
void main()
{
import std.typecons;
Nullable!int a = 42;
someFunc(a);
}
$ dmd test.d
test.d(13): Error: template someFunc cannot deduce function from
argument types !()(Nullable!(int))
Removing the template constraint makes it compile and run just
fine. What's a good work around for these types of issues?
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