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7f918cf1 CE |
1 | (* Copyright (C) 2009 Matthew Fluet. |
2 | * Copyright (C) 1999-2005 Henry Cejtin, Matthew Fluet, Suresh | |
3 | * Jagannathan, and Stephen Weeks. | |
4 | * | |
5 | * MLton is released under a BSD-style license. | |
6 | * See the file MLton-LICENSE for details. | |
7 | *) | |
8 | ||
9 | signature PROPERTY_LIST = | |
10 | sig | |
11 | type t | |
12 | ||
13 | (* remove all properties from the list *) | |
14 | val clear: t -> unit | |
15 | (* pointer equality of property lists *) | |
16 | val equals: t * t -> bool | |
17 | val length: t -> int | |
18 | (* create an empty property list *) | |
19 | val new: unit -> t | |
20 | (* create a new property *) | |
21 | val newProperty: | |
22 | unit -> { | |
23 | (* See if a property is in a property list. | |
24 | * NONE if it isn't. | |
25 | *) | |
26 | peek: t -> 'a option, | |
27 | (* Add the value of the property -- must not already exist. *) | |
28 | add: t * 'a -> unit, | |
29 | (* Remove a property from a property list. | |
30 | * Noop if the property isn't there. | |
31 | *) | |
32 | remove: t -> unit | |
33 | } | |
34 | val stats: unit -> Layout.t | |
35 | end |