Easy way to load an array

[XVilka]

For now Cstruct handles only strings/bytes when you call "copy/get" for fields with [@len N] attribute. It would be quite convenient to add something like

[%%cstruct
type qwe = {
   field1: uint16_t;
   field2: uint64_t [@len 16];
}
]

type myrec = {
   myrec1: int;
   myrec2: int64 array;
}

let load_struct buf =
   let cs_buf = Cstruct.of_bytes buf in
   {
     myrec1 = get_qwe_field1 cs_buf;
     myrec2 = array_qwe_field2 cs_buf;
   }

[hannesm]

my interest and expertise in ppx is small, but this and other feature request make me think that someone should properly scope what ppx_cstruct should do. since you mention array, what about lists of repeated fields? or sets? afaict this is rather open-ended, and if you add some syntax/functions for case x, you'll likely also add them for case y, and you end up in a rather huge amount of code.

i stopped using ppx_cstruct in my projects due to these issues (plus ppx-ocaml-compiler version upgrade pain - which seems like there's some better plan now).