Wikibooks

Rebol Programming/protect-system

< Rebol Programming
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USAGE:

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PROTECT-SYSTEM

DESCRIPTION:

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Protects all system functions and the system object from redefinition.

PROTECT-SYSTEM is a function value.

SOURCE CODE

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protect-system: func [
    {Protects all system functions and the system object from redefinition.} 
    /local vals words word
][
    vals: second system/words 
    words: make block! 1 
    foreach word first system/words [
        if any-function? first vals [append words word] 
        vals: next vals
    ] 
    foreach word bind words 'read [protect word] 
    protect 'system
]
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