On Wednesday, 30 August 2017 at 15:42:09 UTC, jmh530 wrote:
One thing you didn't really cover is how seamlessly interacts with normal polymorphism. For instance, what if to your first example, I add the following function (note: without @method) and adjust main as below. I see no reason why this shouldn't work. But you wouldn't be able to create a string kick(Animal animal) function since that is created by the mixin.


string kick(Dog dog) { return "ct bark"; }

void main()
{
  updateMethods();
  import std.stdio : writeln;
  Animal snoopy = new Dog, hector = new Pitbull;
  writeln("snoopy.kick(): ", snoopy.kick()); // bark
  writeln("hector.kick(): ", hector.kick()); // bark an dbite
  Dog lassie = new Dog;
  writeln("lassie.kick(): ", lassie.kick()); // ct bark
}

What happens here is that kick(Animal) is shadowed by kick(Dog). kick(Animal) is a method but it appears to the user and the compiler as an ordinary function - which is generally good. As such it is eligible for UFCS. I would not recommend this sort of coding, but it's everyone's choice, methods or not.

Likewise, methods can be overloaded (like here https://github.com/jll63/openmethods.d/blob/1.0.0-rc.1/examples/matrix/source/matrix.d#L12).

A current limitation is that default arguments are not supported (yet), although I think it's just a matter of putting the effort in.

UFCS interacts nicely with methods because you can say a.plus(b) even if 'plus' is an open method.


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