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**2**- (**download**) (**annotate**)*Sat Oct 4 23:33:09 1997 UTC*(22 years, 6 months ago) by*monnier*File size: 2923 byte(s)

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(* bit-vector-sig.sml * * COPYRIGHT (c) 1995 by AT&T Bell Laboratories. See COPYRIGHT file for details. * *) signature BIT_VECTOR = sig include MONO_VECTOR (** where type elem = bool **) val fromString : string -> vector (* The string argument gives a hexadecimal * representation of the bits set in the * vector. Characters 0-9, a-f and A-F are * allowed. For example, * fromString "1af8" = 0001101011111000 * (by convention, 0 corresponds to false and 1 corresponds * to true, bit 0 appears on the right, * and indices increase to the left) * The length of the vector will be 4*(size string). * Raises LibBase.BadArg if a non-hexadecimal character * appears in the string. *) val bits : (int * int list) -> vector (* Create vector of the given length with the indices of its set bits * given by the list argument. * Raises Subscript if a list item is < 0 or >= length. *) val getBits : vector -> int list (* Returns list of bits set in bit array, in increasing * order of indices. *) val toString : vector -> string (* Inverse of stringToBits. * The bit array is zero-padded to the next * length that is a multiple of 4. *) val isZero : vector -> bool (* Returns true if and only if no bits are set. *) val extend0 : (vector * int) -> vector val extend1 : (vector * int) -> vector (* Extend bit array by 0's or 1's to given length. * If bit array is already >= argument length, return a copy * of the bit array. * Raises Size if length < 0. *) val eqBits : (vector * vector) -> bool (* true if set bits are identical *) val equal : (vector * vector) -> bool (* true if same length and same set bits *) val andb : (vector * vector * int) -> vector val orb : (vector * vector * int) -> vector val xorb : (vector * vector * int) -> vector (* Create new vector of the given length * by logically combining bits of original * vectors using and, or and xor, respectively. * If necessary, the vectors are * implicitly extended by 0 to be the same length * as the new vector. *) val notb : vector -> vector (* Create new vector with all bits of original * vector inverted. *) val lshift : (vector * int) -> vector (* lshift(ba,n) creates a new vector by * inserting n 0's on the right of ba. * The new vector has length n + length ba. *) val rshift : (vector * int) -> vector (* rshift(ba,n) creates a new vector of * of length max(0,length ba - n) consisting * of bits n,n+1,...,length ba - 1 of ba. * If n >= length ba, the new vector has length 0. *) end where type elem = bool

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