# Structure Bool

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    (* Bool -- SML Basis Library *)

    datatype bool = datatype bool

    val not        : bool -> bool

    val toString   : bool -> string
    val fromString : string -> bool option
    val scan       : (char, 'a) StringCvt.reader -> (bool, 'a) StringCvt.reader

    (*
       [bool] is the type of Boolean (logical) values: true and false.

       [not b] is the logical negation of b.

       [toString b] returns the string "false" or "true" according as b is
       false or true.

       [fromString s] scans a boolean b from the string s, after possible
       initial whitespace (blanks, tabs, newlines).  Returns (SOME b) if s
       has a prefix which is either "false" or "true"; the value b is the
       corresponding truth value; otherwise NONE is returned.

       [scan getc src] scans a boolean b from the stream src, using the
       stream accessor getc.  In case of success, returns SOME(b, rst)
       where b is the scanned boolean value and rst is the remainder of
       the stream; otherwise returns NONE.
    *)

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Moscow ML 2.10