Method `[]=()

Method `[]=

mixed `[]=(object arg, mixed index, mixed val)
mixed `[]=(object arg, string index, mixed val)
mixed `[]=(array arg, int index, mixed val)
mixed `[]=(mapping arg, mixed index, mixed val)
bool `[]=(multiset arg, mixed index, bool val)

Description

Index assignment.

Every lvalue expression with the [] operator becomes a call to this function, i.e. a[b]=c is the same as predef::`[]=(a,b,c).

If arg is an object that implements lfun::`[]=(), that function will be called with index and val as the arguments.

arg can have any of the following types:

object The non-protected (ie public) variable named index will be looked up in arg, and assigned val. array|mapping Index index in arg will be assigned val. multiset If val is 0 (zero), one occurrance of index in arg will be removed. Otherwise index will be added to arg if it is not already there.

Returns

val will be returned.

Note

An indexing expression in a non-lvalue context, i.e. where the index is being queried instead of assigned, uses `[] instead of this function.

See also

`->=(), lfun::`[]=(), `[]