Difference between revisions of "NULL KEY"
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Despite fitting the syntax criteria to be a valid [[key]], when fed to a {{LSLGC|Conditional}} as a key it executes as false. | Despite fitting the syntax criteria to be a valid [[key]], when fed to a {{LSLGC|Conditional}} as a key it executes as false. | ||
Some people say that in most applications NULL_KEY isn't needed, and that an empty string ( "" ) will suffice. Others say that doing so is bad style, can cause hard-to-track-down bugs in your script, and might be unsupported in future code releases. | |||
|examples= | |examples= | ||
<lsl> | <lsl> | ||
Revision as of 21:24, 7 July 2008
| LSL Portal | Functions | Events | Types | Operators | Constants | Flow Control | Script Library | Categorized Library | Tutorials |
Description
Constant: string NULL_KEY = "00000000-0000-0000-0000-000000000000";The string constant NULL_KEY has the value "00000000-0000-0000-0000-000000000000"
While technically a string constant, it is only useful as a key.
Despite fitting the syntax criteria to be a valid key, when fed to a Conditional as a key it executes as false.
Some people say that in most applications NULL_KEY isn't needed, and that an empty string ( "" ) will suffice. Others say that doing so is bad style, can cause hard-to-track-down bugs in your script, and might be unsupported in future code releases.
Caveats
Related Articles
Functions
| • | llAvatarOnSitTarget | |||
| • | llDetectedKey | |||
| • | llGetNotecardLine | |||
| • | llGetLandOwnerAt | |||
| • | llGetPermissionsKey | |||
| • | llGetTexture | |||
| • | llListen |
Events
| • | attach |
Examples
<lsl> integer isKey(key in) {
if(in) return 2; return (in == NULL_KEY);
}//returns 2 if it's a valid key, 1 if it's NULL_KEY </lsl>
Notes
Like any LSO string constants longer then 3 characters and used in multiple places in the code, they should be stored in a global variable. The result will be a considerable memory savings. This does not apply to scripts compiled with Mono. See LSL Constants vs Globals for more information about this and examples.
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