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Is there any way to check the size of a record in Ocaml? Something like sizeof of C/C++?
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It is usually used if you have a function or value that is very similar to some other, but is in some way new or modified. Regarding the :: symbol - as already mentioned, it is used to create lists from a single element and a list ( 1::[2;3] creates a list [1;2;3] ).
The * symbol is used to separate elements of a tuple in data type definitions.
To get from the OCaml representation to the integer, divide by two and round down.
Some is a constructor of the option type. The definition is roughly: type 'a option = Some of 'a | None.
Yes:
# Obj.size (Obj.repr (1,2,3,4,5)) ;;
- : int = 5
But for a record type, the size only depends on the type declaration, so you could just infer it from that.
The actual size occupied in memory is the number returned by Obj.size plus one in words. Words are 32 or 64 bit depending which OCaml version you are using. The additional word is used for book-keeping.
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Besides Obj module, there is also a Objsize library from Dmitry Grebeniuk ( http://forge.ocamlcore.org/projects/objsize/ ). It allows you to get more detailed info about values and its size.
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