template Dptr( T, U...) {
alias T delegate( U args) Dptr;
}
Dptr!(T,U) muddle( T, U...)( Dptr!(T,U) f) {
return f; //or make another delegate in real code
}
unittest {
import std.stdio;
int x = 3;
int scale( int s) { return x * s; }
Dptr!(int,int) f = muddle( &scale);
writeln( f(7));
}
============================================
The above technique seemed natural to me, but I get this message
from dmd:
p1.d(15): Error: template p1.muddle does not match any function
template declaration. Candidates are:
p1.d(7): p1.muddle(T, U...)(Dptr!(T, U) f)
p1.d(15): Error: template p1.muddle(T, U...)(Dptr!(T, U) f)
cannot deduce template function from argument types !()(int
delegate(int))
and if I use muddle!(int,int) instead it doesn't help. This is
likely a misunderstanding on my part --- please show me how to
sort this out.
