Covariant overrides on the Buffer Hierachy (original) (raw)

Zhong Yu zhong.j.yu at gmail.com
Tue Apr 22 02:30:47 UTC 2014

On Mon, Apr 21, 2014 at 7:07 AM, Ulf Zibis <Ulf.Zibis at cosoco.de> wrote:

So to me, this is clearly a language matter, not to solve by tricky footprint and/or performance lasting code on APIs: People want a smart syntax for consecutive method invocations on the same object, that's all!

Amen to that!

However I'm a little concerned with the mental effort a reader needs to figure out the implicit method receiver. I'd like to see more explicitness in establishing the implicit method receiver, something like Pascal's with statement.

expr "."
{
    // expr is the implicit receiver for this block
    foo(); // interpreted as expr.foo()
}

so that we could write

CharBuffer.allocate(26).{position(2);put("C");position(25);put("Z");}

string.{ mySub=subString(indexOf("C"), indexOf("Q")); }

new HashMap<>().{ put(n1,v1); put(n2,v2); }

new Button().{ color(red); text("hello"); onClick(event->color(blue)); }

Zhong Yu

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