I'm working on the next iteration of my Plot2Kill library, and I **really**
have fallen in love with property chaining. It's the greatest thing since
sliced arrays. However, I've run into an issue that I had previously
overlooked:
class Foo {
Type _val;
typeof(this) val(Type newVal) {
_val = newVal;
return this;
}
}
class Bar : Foo {
// More properties.
}
void main() {
auto bar = new Bar;
bar.val(someValue).barProperty(someOtherValue); // Won't work.
}
Given that D2 is mostly finalized, it may be a little late for this, but would
it be feasible, at least far down the road, to add something like an @chain
annotation, which would only allow a member function to return this and would
implicitly downcast it to the subtype that was passed in as the this pointer?
For example, assume we attached @chain to Foo.val():
pragma(msg, typeof(bar.val(someValue))); // Bar, not Foo.
