On Saturday, 9 May 2015 at 17:16:58 UTC, Russel Winder wrote:
Python has tuple assignment so you see things like:
previous, current = current, previous + current
especially if you are doing silly things like calculating
Fibonacci
Sequence values. Translating this to D, you end up with:
TypeTuple!(current, next) = tuple(next , current +next);
This works right now and is quite aesthetically pleasing:
tuple(current, next) = tuple(next , current +next);
Note, however, that this is not a tuple assignment. It is
assignment of a misleadingly-named anonymous struct type that is
implemented in the standard library.
This is an actual tuple assignment as supported by the compiler:
a.tupleof = b.tupleof;
I think it should work for any two structs as long their fields
are public and individually assignment-compatible. I believe it
is as efficient as individual assignments on all D
implementations.
A lot of people seem to want better sugar for tuple or tuple-like
things in D and do not consider std.typecons sufficient (or at
least find the names it uses confusing). Such a feature would
work very nicely with D's auto types, return and lambda argument
type inference, etc. See LINQ.
