On Friday, 12 January 2018 at 22:44:48 UTC, Timon Gehr wrote:
As promised [1], I have started setting up a DIP to improve tuple ergonomics in D:https://github.com/tgehr/DIPs/blob/tuple-syntax/DIPs/DIP1xxx-tg.md This DIP aims to make code like the following valid D: --- auto (a, b) = (1, 2); (int a, int b) = (1, 2); --- ---foreach((sum, diff); [(1, 2), (4, 3)].map!((a, b) => (a + b, a - b))){ writeln(sum, " ", diff); } /+ prints: 3 -1 7 1 +/ ---Before going ahead with it, I'd like some preliminary community input:- I'm not yet completely satisfied with the DIP. (See section "Limitations".)Please let me know suggestions or further concerns you might have.- There are good example use cases missing. While I'm confident I could invent a few of them given a little time, I thought maybe I can expedite the process and make the point more convincingly by asking for use cases you encountered in your own code. The DIP alreadycontains an example due to bearophile. [1] https://forum.dlang.org/post/or625h$2hns$1...@digitalmars.com
Could we also support function tuples? For instance:
int sum(int a, int b) { return a+b; }
int diff(int a, int b) { return a-b; }
(int, int) f = (sum, diff) // no ";" for consistency with
existing syntax
int (x,y) = f(1, 2); // x=3, y=-1 int (w,z) = (1, 2).f() // same as above, UFCS int (u,v) = (1, 2).(sum, diff) // same as above, "lambda tuple"In the last example, (sum, diff) is basically lowered to (x,y) => (sum(x,y), diff(x,y)).
