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higher-order macro

higher-order macro in Technology

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.
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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