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[smlnj] View of /sml/trunk/src/cm/semant/group-reg.sml
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View of /sml/trunk/src/cm/semant/group-reg.sml

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Revision 281 - (download) (annotate)
Tue May 18 14:57:00 1999 UTC (22 years, 4 months ago) by blume
File size: 561 byte(s)
GroupReg added; bad error msg behavior fixed
signature GROUPREG = sig
    val clear : unit -> unit
    val register : AbsPath.t * GenericVC.Source.inputSource -> unit
    val lookup : AbsPath.t -> GenericVC.Source.inputSource
    val registered : AbsPath.t -> bool

structure GroupReg :> GROUPREG = struct

    val m  =
	ref (AbsPathMap.empty: GenericVC.Source.inputSource AbsPathMap.map)

    fun clear () = m := AbsPathMap.empty
    fun register (g, s) = m := AbsPathMap.insert (!m, g, s)
    fun lookup g = valOf (AbsPathMap.find (!m, g))
    fun registered g = isSome (AbsPathMap.find (!m, g))

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