Checking record size in ocaml?

Question

Is there a way to check the recording size in Ocaml? Something like sizeof for C / C ++?

Answer 1

Yes:

 # Obj.size (Obj.repr (1,2,3,4,5)) ;; - : int = 5 

But for a record type, the size depends only on the type declaration, so you can simply infer it from this.

The actual size occupied in memory is the number returned by Obj.size plus one in words. Words are 32 or 64 bits, depending on which version of OCaml you are using. An additional word is used for accounting.

Answer 2

In addition to the Obj module, there is also the Objsize library from Dmitry Grebenyuk ( http://forge.ocamlcore.org/projects/objsize/ ). It allows you to get more detailed information about the values ​​and size.