Syntax

  define return-type infix-function
   ( value type name
   operator
   value type name
   as function-body) | elsewhere

You can use define infix-function to define an infix function or operator. An infix function is a function that takes exactly two arguments. The function name is placed between the first and the second argument. The function name may be an OmniMark name or symbol.

The following example defines an infix function to determine the distance between two characters in the ASCII character set:

  define integer infix-function
   value stream a
   distance
   value stream b
   as
     assert length of a = 1 & length of b = 1
      message "Single characters only please."
     return binary b - binary a

  process

     output "d" % ("A" distance "Q")  

An infix function must return a value. The arguments to an infix function must be passed as value arguments.

Infix functions may be overloaded but not dynamic or external.

Related Syntax    define function    define conversion-function    define overloaded function, dynamic, overridding

Related Concepts    Functions    Functions: infix    Functions: overloaded    Names and symbols

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