You can probably use `cstring` if on a C backend, but if you wanted to index
some other element type than `char` (like `int` or `Foo`) you can also do
let foos = cast[ptr UncheckedArray[Foo]](mmaped_file.mem)
if i * Foo.sizeof < mmapped_file.size:
doSomethingWith foos[i] # e.g. i == 0 for 1st Foo
Run
You may well be able to skip the range check every time if you are, e.g.
looping over the file & know you won't overflow from that, etc. To recover
automatic bounds checks, you can write new/use existing procs accepting
`openArray[Foo]` (e.g. `openArray[T]`) and pass via `toOpenArray` explicitly in
the parameter list:
fun(toOpenArray(mf.mem, 0, mf.size div Foo.size - 1), a, b, c)
Run
That can be abbreviated with a `template oaFoo(mf)` if you need to pass it or
various files in several places or something. If such procs want to modify the
data the file needs to have been opened writable or you will get segmentation
violations.
