Single "alias this"

[Deokjae Lee]

Thank you for the reply.
Actually I tested a code like this.

//interfaces first, base class last
class Foo : I1, I2, Base {}

This doesn't compile.
I didn't know the order of base class and interfaces matter.


> As for alias this, it's not about dynamic polymorphism like class
> inheritance. All it does is forward unresolved method calls to the alias
> this'ed member.

I'm reading TDPL and it says "alias this" in a relation with multiple 
subtyping. Polymorphism can be achieved using a nested class extending 
the base class and implicit conversion. So, I can't get the role of the 
"alias this" differentiated from inheritance.

And...

import std.stdio;

class A {
	void func() {
		writeln("A");
	}
}

class B : A {
	override void func() {
		writeln("B");
	}
}

class C {
	private B b;
	alias b this;
	
	this() {
		b = new B();
	}
}

void main() {
	C c = new C();
	c.func();
	A a = c;
	a.func();
}

The output is the following.

B
zsh: segmentation fault  ./Test3

Hmm... Are the last two lines of main illegal?