@griffith1deady is right, `ptr UncheckedArray` is the way to go. What this
means is basically just that Nim won't make any bounds checks to see if access
to this array is valid or not. This is similar to C where, even given a strict
definition as above, array access is purely a runtime error. Also the
declaration `const uint8_t some_array[303530]` basically just means that 303530
elements of `uint8_t` size should be allocated on the stack, and `some_array`
holds a pointer to this array (which is the same as a pointer to the first
element in C). So your examples become:
let some_array_size: cint {.importc.}
let some_array: ptr UncheckedArray[uint8] {.importc.}
proc some_func(buf: ptr UncheckedArray [uint8], buf_len: cint) {.importc,
header: "some_library.h".}
some_func(some_array, some_array_size)
Run
Unfortunately there is no way to express the `const` modifier properly in Nim,
but you'll get errors from the C compiler if you violate this constraint. Of
course I'd always recommend using automatic wrapping with Futhark where
possible. Although if you don't have a header (??) it might get tricky. You
could of course write a valid header file yourself.
