# Structure CharVectorSlice

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    (* CharVectorSlice -- SML Basis Library *)

    type elem = Char.char
    type vector = CharVector.vector

    type slice = Substring.substring

    val length   : slice -> int
    val sub      : slice * int -> elem
    val slice    : vector * int * int option -> slice
    val full     : vector -> slice
    val subslice : slice * int * int option -> slice
    val base     : slice -> vector * int * int
    val vector   : slice -> vector
    val concat   : slice list -> vector
    val isEmpty  : slice -> bool
    val getItem  : slice -> (elem * slice) option

    val find     : (elem -> bool) -> slice -> elem option
    val exists   : (elem -> bool) -> slice -> bool
    val all      : (elem -> bool) -> slice -> bool

    val app      : (elem -> unit) -> slice -> unit
    val map      : (elem -> elem) -> slice -> vector
    val foldl    : (elem * 'b -> 'b) -> 'b -> slice -> 'b
    val foldr    : (elem * 'b -> 'b) -> 'b -> slice -> 'b

    val findi    : (int * elem -> bool) -> slice -> (int * elem) option
    val appi     : (int * elem -> unit) -> slice -> unit
    val mapi     : (int * elem -> elem) -> slice -> vector
    val foldli   : (int * elem * 'b -> 'b) -> 'b -> slice -> 'b
    val foldri   : (int * elem * 'b -> 'b) -> 'b -> slice -> 'b

    val collate  : (elem * elem -> order) -> slice * slice -> order

    (*
       [slice] is the type of CharVector slices, that is, sub-vectors of
       CharVector.vector values.  Since a CharVector.vector is a string, a
       slice is the same as a substring, and slices may be processed using
       the functions defined as well as those in structure Substring.

       The slice (a,i,n) is valid if 0 <= i <= i+n <= size s,
                    or equivalently, 0 <= i and 0 <= n and i+n <= size s.
       A valid slice sli = (a,i,n) represents the sub-vector a[i...i+n-1],
       so the elements of sli are a[i], a[i+1], ..., a[i+n-1], and n is
       the length of the slice.  Only valid slices can be constructed by
       these functions.

       All operations are as for VectorSlice.slice.
    *)

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Moscow ML 2.10