Difference between revisions of "Typecast"
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To convert the type of a value a typecast is required. There are two types of typecasting, explicit and implicit. Explicit typecasts must be provided by the programmer, but implicit typecasts are put in place by the compiler. LSL implicitly typecasts strings to keys and integers to floats where the latter type is required but the former is provided. | To convert the type of a value a typecast is required. There are two types of typecasting, explicit and implicit. Explicit typecasts must be provided by the programmer, but implicit typecasts are put in place by the compiler. LSL implicitly typecasts strings to keys and integers to floats where the latter type is required but the former is provided. | ||
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!colspan="9"| Supported Typecasts | !colspan="9"| Supported Typecasts | ||
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*The compiler allows explicit typecasting where it is not needed and does not optimize it out. Unnecessary typecasts will bloat code and slow it down. | *The compiler allows explicit typecasting where it is not needed and does not optimize it out. Unnecessary typecasts will bloat code and slow it down. | ||
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== Notes == | |||
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*For getting at the elements of a list use the [[llList2*]] functions. | |||
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Revision as of 04:57, 16 May 2008
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To convert the type of a value a typecast is required. There are two types of typecasting, explicit and implicit. Explicit typecasts must be provided by the programmer, but implicit typecasts are put in place by the compiler. LSL implicitly typecasts strings to keys and integers to floats where the latter type is required but the former is provided.
| Supported Typecasts | ||||||||
|---|---|---|---|---|---|---|---|---|
| To | ||||||||
| integer | float | string | key | list | vector | rotation | ||
| From | integer | x | x | x | x | |||
| float | x | x | x | x | ||||
| string | x | x | x | x | x | x | x | |
| key | x | x | x | |||||
| list | x | x | ||||||
| vector | x | x | x | |||||
| rotation | x | x | x | |||||
Syntax: (type)value
Converts value to type.
| • expression | type | – | variable type | |
| • expression | value | – | expression or constant |
If value is a complex expression, it may be beneficial to wrap it in parentheses. (type)(value)
Examples
<lsl>string a = "1.5"; float b = (float)a; integer c = (integer)a;</lsl>
Caveats
- The compiler allows explicit typecasting where it is not needed and does not optimize it out. Unnecessary typecasts will bloat code and slow it down.
Notes
- For getting at the elements of a list use the llList2* functions.