Hello everyone.
I understand that topic has already been discussed in the past, but I failed to
get any information on its current state of affairs.
I guess the subject of this mail is explicit, but to make sure I’m clear,
here's a small snippet that illustrates the problem:
func f(args: Int…) {
// Some implementation ...
}
// Now it's impossible to call f without explicitly naming its parameters.
For many use-cases, this problem can be solved by overloading f so that it
explicitly accepts an array.
func f(_ args: [Int]) {
// Some implementation ...
}
func f(_ args: Int…) {
f(args)
}
Some people also advocate (myself generally included) that one should prefer
the signature explicitly marking args as an array, as the syntactic overhead of
wrapping the arguments with “[]” when calling f is arguably bearable. However,
in some other situations, this approach might not be applicable. For instance,
one may simply not be able to modify the original function. Another use-case
may be a function that should forward its own variadic parameters.
In a variety of other languages, there exists a way to do this. For instance,
Python can “unpack” (or splat) a list into function arguments by prefixing it
with *:
def f(*args):
# Some implementation …
f(*[1, 2, 3]) # == f(1, 2, 3)
I was wondering if such feature could be supported by Swift, and if not, why.
Syntactically, I like the use of “…”, which would mirror function signatures:
f(…[1, 2, 3]) // == f(1, 2, 3)
Thanks.
--
Dimitri Racordon
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