mappingClear()
Deletes all entries of a mapping.
Synopsis
int mappingClear(mapping &m);
Parameters
Parameter | Description |
---|---|
m | Mapping whose entries should be deleted. |
Return value
The function returns 0 when the entries were successfully deleted otherwise, -1.
Error
0 when the function was executed successfully, otherwise -1.
Description
Deletes all entries of a mapping. Mappings save arbitrary key and value pairs. The keys and values are saved
in two arrays (one for keys and one for values). A mapping with key:value pairs "one": 1, "two":2, "three":3 looks internally as follows:
key value
"one" 1
"two" 2
"three" 3
The values for the keys are searched via the keys. The keys can be of an arbitrary type and the types can be mixed (so that not only one type is used). If you want to find the value for the key "one", the position of the key "one" will be searched in the key array and the value at this position in the value array will be returned.
Example
main()
{
int i;
mapping m;
m["one"]=1; //sets the value to 1
m["two"]=2; //sets the value to 2
DebugN("The value of m[one]is="+m["one"], "the value should
be=1");
DebugN("The value of m[two]is="+m["two"], "the value should
be=2");
i = m["one"]; //sets i to the value of "one"
DebugN("i is="+i, "i should be =1");
int l;
l = mappingClear(m);
DebugN("Function was executed successfully ", l, "Mapping is
empty", m);
}
Assignment
Miscellaneous functions (mapping)
Availability
CTRL, UI