OCaml map of int keys :: where is the 'simple' int module to use with the Map.Make functor?

Question

I need an OCaml map with keys of type int so I am using Map.Make to create one. However it seems that the standard modules 'only' provide modules like Big_int, Int32, Int64 and Nativeint which require conversions. So I have to do things like: ``` module IntMap = Map.Make(Int32) let a_map = IntMap.add (Int32.of_int 0) "zero" IntMap.empty ;; ``` ... which I would rather avoid or define my own silly Int module do deal with simple int literals or values without requiring conversion functions: ``` module Int = struct type t = int let compare x y = if x < y then -1 else if x > y then 1 else 0 end ;; module IntMap = Map.Make(Int) let a_map = IntMap.add 0 "zero" IntMap.empty ;; ``` Am I missing something obvious here?

Accepted Answer

The simplest way to have an int map is to do the following:

```
module IntMap = Map.Make(struct type t = int let compare = compare end)
```

OCaml map of int keys :: where is the 'simple' int module to use with the Map.Make functor?

Solution

Problem