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[Ephemeron] Advise to use {!filter_map_inplace} 

Add another example of use.
master
François Bobot 2016-01-25 08:41:53 +01:00
parent e77b7aba50
commit dbf2b8f90b
1 changed files with 7 additions and 0 deletions
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7
stdlib/ephemeron.mli
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@ -23,6 +23,10 @@
implementation using {Hashtbl.t} is not suitable, because all implementation using {Hashtbl.t} is not suitable, because all
associations would keep in memory the arguments and the result. associations would keep in memory the arguments and the result.
Ephemerons can also be used for "adding" a field to an arbitrary
boxed ocaml value: you can attach an information to a value
created by an external library without memory leaks.
Ephemerons hold some keys and one or no data. They are all boxed Ephemerons hold some keys and one or no data. They are all boxed
ocaml values. The keys of an ephemerons have the same behavior ocaml values. The keys of an ephemerons have the same behavior
than weak pointers according to the garbage collector. In fact than weak pointers according to the garbage collector. In fact
@ -65,6 +69,9 @@ module type S = sig
the bindings are weak, [mem h k] is true doesn't mean that a the bindings are weak, [mem h k] is true doesn't mean that a
just following [find h k] will not raise the exception just following [find h k] will not raise the exception
[Not_found] since the garbage collector can run between the two. [Not_found] since the garbage collector can run between the two.
Secondly during an iteration the table shouldn't be modified use
instead {!filter_map_inplace} for that purpose.
*) *)
include Hashtbl.S include Hashtbl.S