meaning of higher order

1. higher-order function HOF A function that can take one or more functions as argument and/or return a function as its value. E. g. map in map f l which returns the list of results of applying function f to each of the elements of list l. See also curried function. higher-order macro A means of expressing certain higher-order functions in a first order language. Proposed by Phil Wadler. Higher-order macros cannot be recursive at the top level but they may contain recursive definitions. E. g. map f l = m l where m [] = [] m x:xs = f x : m xs Expanding a call to this macro is equivalent to specialising a call to map in its first argument. See partial evaluation. High-level Data Link Control HDLC A general-purpose data link control protocol defined by ISO for use on both point-to-point and multipoint multidrop data links. It supports full-duplex, transparent-mode operation. It is used extensively in both multipoint and computer networks. Some manufacturers and other standards bodies still use their own acronyms, e. g. IBMs SDLC Synchronous Data Link Control, the forerunner of HDLC and ANSIs ADCCP Advanced Data Communications Control Procedure. [Fred Halsall, "Data Communications, Computer Networks and Open Systems" 4th edition, 1996, p. 237, Addison-Wesley Publishing Co. Reading, Mass. , USA].


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