it would also solve a long-standing issue of passing runtime optional arguments along with variadic templates, eg:
current: ``` # current: bad, causes template bloat (1 template per call site) void log(string file=__FILE__, int line=__LINE__, T...)(T a); # usage: log(1, "foo"); # with this DIP void log(T...)(T a, string file=__FILE__, int line=__LINE__); log((1, "foo")); ``` still not ideal as syntax is not as nice, but at least it removes template bloat On Fri, Jan 12, 2018 at 2:44 PM, Timon Gehr via Digitalmars-d <digitalmars-d@puremagic.com> 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 already > contains an example due to bearophile. > > > [1] https://forum.dlang.org/post/or625h$2hns$1...@digitalmars.com
