Yes, this is a smart workaround..... i hope we will have something better
in Rust but this a good answer to this need.
Regards,
On 07/09/13 22:11, Renato Lenzi wrote:
> Is it possibile, or will be possibile, to use default parameters and/or
> named parameters in Rust?
> In the docs i couldn't find anything about this (may be my fault...)
> Regards.
>
> It is not possible currently, but there's an open bug [6973] and with
(quite) a bit of discussion. Two current methods for simulating them would
be defining wrapper functions for the common shortcuts, or passing the
default/named args as a struct and use a "functional record update" (FRU),
e.g.
struct FooArgs {
x: int,
y: int,
z: int,
}
static DEFAULT_FOO: FooArgs = FooArgs { x: 1, y: 2, z: 3 };
/// a, b are compulsory, anything in rest is a default arg
fn foo(a: uint, b: uint, rest: FooArgs) { ... }
fn main() {
// only defaults
foo(10, 100, DEFAULT_FOO);
// y = -3, defaults for the rest
foo(10, 100, FooArgs { y: -3, .. DEFAULT_FOO }) // `..` indicates an FRU
}
This one is unfortunately ugly, but it seems to get the job done.
Huon
[6973]:
https://github.com/mozilla/**rust/issues/6973<https://github.com/mozilla/rust/issues/6973>
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