ceylon - 将类似 DSL 的 contrustor 调用与匿名类声明相结合

Question

可能吗？
我试过这样的事情：

object foo extends Foo {
    constructorNamedArg = "qqq";
} {
    abstractMethod() => bar.baz();
}

Answer 1

I would not use inheritance for this. Instead I would define Foo as a concrete class:

class Foo(String constructorNamedArg, Baz abstractMethod()) {}

And now at the call site I would write:

Foo {
    constructorNamedArg = "qqq";
    abstractMethod() => bar.baz();
}

Or even:

Foo {
    constructorNamedArg = "qqq";
    function abstractMethod() { 
        return bar.baz(); 
    }
}

It's a common refactoring in Ceylon to go from abstract class with formal methods to concrete class parameterized by functions.

HTH

Answer 2

根据规范，不可能，只能有位置参数列表。