Proposal: Object/?? Destruction

[Timon Gehr]

On 05.10.2017 17:48, jmh530 wrote:
> On Thursday, 5 October 2017 at 06:42:14 UTC, Timon Gehr wrote:
>>
>> Why curly braces? Multiple function arguments are a form of built-in 
>> tuple, so the syntax should be consistent:
>>
>> auto (success, message) = callVoldemortFunction();
>>
>> The only unresolved question is (as using the result of the comma 
>> operator has been deprecated already): How to write a unary tuple. My 
>> favourite is what python does: "(3,)". This is however already 
>> accepted as a function argument list. I think it is worth breaking 
>> though. Maybe we should deprecate it.
> 
> The curly bracket syntax looks straight out of DIP 32
> 
> https://wiki.dlang.org/DIP32
> auto {x, y} = {1, "hi"};.

There are many good ideas in DIP32, including this one:

> Basic () syntax, perhaps the cleanest, but can't be used:
> 
> ----
> import std.stdio, std.algorithm, std.container, std.array;
> 
> auto encode(T)(Group!("a == b", T[]) sf) {
>     auto heap = sf.map!((c, f) => (f, [(c, "")])).array.heapify!q{b < a};
> 
>     while (heap.length > 1) {
>         auto (lof, loa) = heap.front;  heap.removeFront;
>         auto (hif, hia) = heap.front;  heap.removeFront;
>         foreach ((_, ref e); loa) e = '0' ~ e;
>         foreach ((_, ref e); hia) e = '1' ~ e;
>         heap.insert((lof + hif, loa ~ hia));
>     }
>     return heap.front[1].schwartzSort!((c, e) => (e.length, c));
> }
> 
> void main() {
>     auto s = "this is an example for huffman encoding"d;
>     foreach ((c, e); s.dup.sort().release.group.encode)
>         writefln("'%s'  %s", c, e);
> }
> ---

The reason why back then it seemed as if it "can't be used" is that it 
was taken by the comma operator. This is no longer the case.