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.
| 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
string a = "1.5"; float b = (float)a; integer c = (integer)a; integer i; i = (integer) 1.23; // 1 i = (integer) -1.23; // -1 i = (integer) "0123"; // 123 i = (integer) "0x12A"; // 298 float f; f = (float) "6.2e1"; // 62.0 // "6.2e1", "6.2e+1", "6.2E1", "6.2E+1" are all equivalent. string s; s = (string) [1, 2.3, "a"]; // "12.300000a" s = (string) <1.0, 2.3, 4.56>; // "<1.00000, 2.30000, 4.56000>" list l; l = (list) ""; // [""] l = (list) <1.0, 2.3, 4.56>; // ["<1.00000, 2.30000, 4.56000>"] vector v; v = (vector) "<1.0, 2.3, 4.56>"; // <1.0, 2.3, 4.56> v = (vector) "<1.0, 2.3>"; // ZERO_VECTOR (Due to insufficient value) rotation r; r = (rotation) "<1.0, 2.3, 4.56, 1.0>"; // <1.0, 2.3, 4.56, 1.0> r = (rotation) "<1.0, 2.3, 4.56>"; // ZERO_ROTATION (Due to insufficient value)
Example n°2
integer BOOT_TIME; float BOOT_TIME_2; string BOOT_T ; string BOOT_CHAN; default { state_entry() { BOOT_TIME = llGetUnixTime(); BOOT_T = (string)BOOT_TIME; BOOT_TIME_2 = llGetTimeOfDay(); BOOT_CHAN = (string)BOOT_TIME_2; llSetObjectDesc( BOOT_T); llSetText(BOOT_CHAN,<1.0,0.0,0.0>,1.0); } }
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.
