Semantics of toString

[Don]

Lutger wrote:
> Don wrote:
> ...
>> There is a definite use for such as thing. But the existing toString()
>> is much, much worse than useless. People think you can do something with
>> it, but you can't.
>> eg, people have asked for BigInt to support toString(). That is an
>> over-my-dead-body.
> 
> Since you are in the know and probably the biggest toString() hater around: 
> are there plans (or rejections thereof) to change toString() before D2 turns 
> gold? Seems to me it could break quite some code.


I'm hoping someone will come up with a design.

Straw man:

void toString(void delegate(const(char)[]) sink, string fmt) {

// fmt holds the format string from writefln/formatln.
// call sink() to print partial results.

}