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An indexed collection of elements. Provides basic functionality for retrieving elements at a specific position, searching for elements. Indexes are zero-based, such that the last element in the array is stored at the index
For an array which can be modified, see
Neither interface makes any attempt to protect the individual elements from modification. The convention is that the elements of the array should not be modified. Documentation within a specific interface should describe variations from this convention.
It is also convention that if an interface provides access to an
nsIArray, that the array should not be QueryInterfaced to an
nsIMutableArray for modification. If the interface in question had intended the array to be modified, it would have returned an
null is a valid entry in the array, and as such any
nsISupports parameters may be
null, except where noted.
| || ||The number of elements in the array. Read only.|
Enumerate the array.
A new enumerator positioned at the start of the array.
- If the array is empty (to make it easy to detect errors).
- If there is not enough memory to complete the operation.
Get the position of a specific element. Note that since
null is a valid input, exceptions are used to indicate that an element is not found.
unsigned long indexOf( in unsigned long startIndex, in nsISupports element );
- The initial element to search in the array. To start at the beginning, use 0 as the
- The element you are looking for.
A number >=
startIndex which is the position of the element in the array.
- If the element was not in the array.
Retrieve a specific element of the array, and
QueryInterface it to the specified interface.
null is a valid result for this method, but exceptions are thrown in other circumstances.
void queryElementAt( in unsigned long index, in nsIIDRef uuid, [iid_is(uuid), retval] out nsQIResult result );
- Position of element.
- The IID of the requested interface.
- The object,
QueryInterface'd to the requested interface.
- When index >