G.setfenv
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Revision as of 20:18, 11 November 2009 by Crazy Quebecer (Talk | contribs)
| Function | |
| Syntax |
setfenv( function Affected Function : Integer Stack Level , Table Environment ) Where is this used? |
| Description: | |
| Sets what a function sees as the global environment, or to put it another way, what table the function searches when you call up a global variable. | |
| Returns: | function |
| Part of Library: | Global Functions |
| Realm: |
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| BBCode Link: | [b][url=http://wiki.garrysmod.com/?title=G.setfenv]G.setfenv [img]http://wiki.garrysmod.com/favicon.ico[/img][/url][/b] |
Examples
| Description | A demonstration of the function. |
|---|---|
| Used on | |
| Code | a = 10 -- A Global Variable setfenv( 1, {GLOBAL = _G} ) -- Set The Environment To An Empty Table ( 1 means the current function on the callstack ) -- _G is the default Global Environment -- We preserve the ability to call upon it by storing it into 'GLOBAL' print(a) --> nil, ( because the new environment has no 'a' index this returns nil ) print(GLOBAL.a) --> 10 , ( 'a' still exists in the old environment, so it can still be referenced this way ) -- going backwards... setfenv(1, GLOBAL) -- Sets the global environment back to the original one print(a) --> 10 , ( now we're back in the old environment we can get the value of 'a' as normal ) print(GLOBAL) --> nil, ( 'GLOBAL' doesn't exist in this environment, so this will return nil ) |
| Output | nil, 10. |
Additional Notes
- You can use a positive integer instead of a function for the 1st argument, this represents the stack level of the function to be affected. 1 is the current function, 2 is the function calling the current function, and so on.
