Difference between revisions of "ListCast"
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(New page: {{LSL_Function |func=listCast |func_desc=Iterates through the contents of a list, producing a resulting list whose contents are cast to a single type. Please refer to [[LlGetListEntryType|...) |
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|func_desc=Iterates through the contents of a list, producing a resulting list whose contents are cast to a single type. Please refer to [[LlGetListEntryType|llGetListEntryType()]] for valid types. This function is useful for converting a list to a type which is more memory efficient, or to a type that you know you are going to access a lot (in order to remove extra casting later-on). | |func_desc=Iterates through the contents of a list, producing a resulting list whose contents are cast to a single type. Please refer to [[LlGetListEntryType|llGetListEntryType()]] for valid types. This function is useful for converting a list to a type which is more memory efficient, or to a type that you know you are going to access a lot (in order to remove extra casting later-on). | ||
|return_type=list | |return_type=list | ||
|return_text= | |return_text=whose contents are all one type. | ||
|p1_type=list|p1_name=mixedList|p1_desc=The list to cast, its contents may be anything. | |p1_type=list|p1_name=mixedList|p1_desc=The list to cast, its contents may be anything. | ||
|p2_type=integer|p2_name=type|p2_desc= | |p2_type=integer|p2_name=type|p2_desc=The type of variable to cast all entries to. | ||
|mode=user | |mode=user | ||
|cat1=Examples | |cat1=Examples | ||
|cat2=Library | |cat2=Library | ||
|cat3=User-Defined Functions | |||
|examples=<source lang="lsl2"> | |||
list mixed = [1, 2.0, "3", "Four", (key)"8aef4875-6873-0919-f5ab-c9d6b48d18d4"]; | |||
// Prints: 1, 2, 3, 0, 8 | |||
llOwnerSay(llList2CSV(listCast(mixed, TYPE_INTEGER))); | |||
// Prints: 1.000000, 2.000000, 3.000000, 0.000000, 0.000000 | |||
llOwnerSay(llList2CSV(listCast(mixed, TYPE_FLOAT))); | |||
</source> | |||
}} | }} | ||
= Implementation = | = Implementation = | ||
< | <source lang="lsl2">list listCast(list mixedList, integer type) { | ||
list result = []; integer x = mixedList != []; | list result = []; integer x = mixedList != []; | ||
if (type == TYPE_INTEGER) | if (type == TYPE_INTEGER) | ||
while ( | while (x) | ||
result = ( | result = [(integer)llList2String(mixedList, --x)] + result; | ||
else if (type == TYPE_FLOAT) | else if (type == TYPE_FLOAT) | ||
while ((--x) | while (x) { | ||
if (llGetListEntryType(mixedList, --x) == TYPE_FLOAT) result = [llList2Float(mixedList, x)] + result; | |||
else result = [(float)llList2String(mixedList, x)] + result; | |||
} | |||
else if (type == TYPE_VECTOR) | else if (type == TYPE_VECTOR) | ||
while ((--x) | while (x) { | ||
if (llGetListEntryType(mixedList, --x) == TYPE_VECTOR) result = [llList2Vector(mixedList, x)] + result; | |||
else result = [(vector)llList2String(mixedList, x)] + result; | |||
} | |||
else if (type == TYPE_ROTATION) | else if (type == TYPE_ROTATION) | ||
while ((--x) | while (x) { | ||
if (llGetListEntryType(mixedList, --x) == TYPE_ROTATION) result = [llList2Rot(mixedList, x)] + result; | |||
else result = [(rotation)llList2String(mixedList, x)] + result; | |||
} | |||
else if (type == TYPE_STRING) | else if (type == TYPE_STRING) | ||
while ( | while (x) | ||
result = | result = [llList2String(mixedList, --x)] + result; | ||
else if (type == TYPE_KEY) | else if (type == TYPE_KEY) | ||
while ( | while (x) | ||
result = [llList2Key(mixedList, --x)] + result; | |||
else result = | else result = mixedList; | ||
return | return result; | ||
}</ | }</source> | ||
{{LSLC|Examples}} | {{LSLC|Examples}} | ||
Latest revision as of 15:17, 22 January 2015
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Summary
Function: list listCast( list mixedList, integer type );
Iterates through the contents of a list, producing a resulting list whose contents are cast to a single type. Please refer to llGetListEntryType() for valid types. This function is useful for converting a list to a type which is more memory efficient, or to a type that you know you are going to access a lot (in order to remove extra casting later-on).
Returns a list whose contents are all one type.
| • list | mixedList | – | The list to cast, its contents may be anything. | |
| • integer | type | – | The type of variable to cast all entries to. |
Examples
list mixed = [1, 2.0, "3", "Four", (key)"8aef4875-6873-0919-f5ab-c9d6b48d18d4"];
// Prints: 1, 2, 3, 0, 8
llOwnerSay(llList2CSV(listCast(mixed, TYPE_INTEGER)));
// Prints: 1.000000, 2.000000, 3.000000, 0.000000, 0.000000
llOwnerSay(llList2CSV(listCast(mixed, TYPE_FLOAT)));
Implementation
list listCast(list mixedList, integer type) {
list result = []; integer x = mixedList != [];
if (type == TYPE_INTEGER)
while (x)
result = [(integer)llList2String(mixedList, --x)] + result;
else if (type == TYPE_FLOAT)
while (x) {
if (llGetListEntryType(mixedList, --x) == TYPE_FLOAT) result = [llList2Float(mixedList, x)] + result;
else result = [(float)llList2String(mixedList, x)] + result;
}
else if (type == TYPE_VECTOR)
while (x) {
if (llGetListEntryType(mixedList, --x) == TYPE_VECTOR) result = [llList2Vector(mixedList, x)] + result;
else result = [(vector)llList2String(mixedList, x)] + result;
}
else if (type == TYPE_ROTATION)
while (x) {
if (llGetListEntryType(mixedList, --x) == TYPE_ROTATION) result = [llList2Rot(mixedList, x)] + result;
else result = [(rotation)llList2String(mixedList, x)] + result;
}
else if (type == TYPE_STRING)
while (x)
result = [llList2String(mixedList, --x)] + result;
else if (type == TYPE_KEY)
while (x)
result = [llList2Key(mixedList, --x)] + result;
else result = mixedList;
return result;
}