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 string a
   distance
   value string 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 function, define function define conversion-function define overloaded function, dynamic, overriding

Related Concepts Functions Functions: infix Functions: overloaded Modules, defining Names and symbols

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