[generics]The ability to allow different length arrays and slices

[hsoo...@gmail.com]

Right now as I understand it, I would still have to write a different generic function for different length arrays, or one that accepted slices. as per:

// Accept slices of T
func someSliceFunc(type T)(s []T){ ... }
// Accept a 1 member array of T
func someArrayFunc(type T)(a [1]T){ ... }
...
// For what ever number of specific length arrays you wish to support.
func someBiggerArrayFunc(type T)(a [???]T){ ... }


It would be nice to indicate the generic function accepts any length of array as well as slices, something like:

// Accept any length of array or slice of T
func someFunc(type T)(a [...]T){ ... }


Where the [...] indicates the function works with any length array or a slice.

Russell

[Axel Wagner]

Why not just accept slices only and expect the caller to add a `[:]`? It's not quite as ergonomic, but should have the same effect and we wouldn't need to add complexity to the design.

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[benjamin...@gmail.com]

Clearly that's a workaround though.  Like how you can copy a slice of bytes without calling copy by casting it to a string and then back to []bytes.  It gets the job done, but it's weird and not obvious.

On Wednesday, July 15, 2020 at 12:14:19 PM UTC-7, Axel Wagner wrote:

Why not just accept slices only and expect the caller to add a `[:]`? It's not quite as ergonomic, but should have the same effect and we wouldn't need to add complexity to the design.

On Wed, Jul 15, 2020 at 4:58 PM <hsoo...@gmail.com> wrote:

Right now as I understand it, I would still have to write a different generic function for different length arrays, or one that accepted slices. as per:

// Accept slices of T
func someSliceFunc(type T)(s []T){ ... }
// Accept a 1 member array of T
func someArrayFunc(type T)(a [1]T){ ... }
...
// For what ever number of specific length arrays you wish to support.
func someBiggerArrayFunc(type T)(a [???]T){ ... }


It would be nice to indicate the generic function accepts any length of array as well as slices, something like:

// Accept any length of array or slice of T
func someFunc(type T)(a [...]T){ ... }


Where the [...] indicates the function works with any length array or a slice.

Russell

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