.TH "Oo" 3o 2023-09-20 OCamldoc "OCaml library"
.SH NAME
Oo \- Operations on objects
.SH Module
Module   Oo
.SH Documentation
.sp
Module
.BI "Oo"
 : 
.B sig end

.sp
Operations on objects

.sp

.sp
.sp

.I val copy 
: 
.B (< .. > as 'a) -> 'a
.sp

.ft B
Oo\&.copy o
.ft R
returns a copy of object 
.ft B
o
.ft R
, that is a fresh
object with the same methods and instance variables as 
.ft B
o
.ft R
\&.

.sp

.I val id 
: 
.B < .. > -> int
.sp
Return an integer identifying this object, unique for
the current execution of the program\&. The generic comparison
and hashing functions are based on this integer\&. When an object
is obtained by unmarshaling, the id is refreshed, and thus
different from the original object\&. As a consequence, the internal
invariants of data structures such as hash table or sets containing
objects are broken after unmarshaling the data structures\&.

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