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Learn Red ? Fundamentals of Red
book

Learn Red ? Fundamentals of Red

by Ivo Balbaert
May 2018
Beginner content levelBeginner
252 pages
6h 19m
English
Packt Publishing
Content preview from Learn Red ? Fundamentals of Red

Calling a Red/System script from within Red

To delegate high-performance code snippets to Red/System, we need a way to call into Red/System from Red. Suppose we want to call our Red/System fact function from a Red script. This is done as follows:

;-- see Chapter10/use-fact.red:#system-global [#include %fact.reds]          ; (1)red-fact: routine [                           ; (2)    n [integer!]                              ; (3)    return: [integer!]][    fact n  ; function from fact.reds         ; (4)]print red-fact 9 ;== 362880                   ; (5)

In line (1), the Red/System script is included as usual Red scripts, but it must be prefixed by #system-global, a directive. This line also executes the Red/System script, so be sure to remove or comment out any executable code from it. As indicated in line (2), a Red function that calls ...

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Publisher Resources

ISBN: 9781789130706Supplemental Content