MoveFromId (Stringlist subroutine)

Move data from $list to Stringlist (Stringlist class)

This method moves data ($list items) from a $list to a stringlist. MoveFromId is a subroutine that accepts one argument: the $list identifier of the $list from which data is to be moved. For more information about $list identifiers, see the Sirius Functions Reference Manual.

Syntax

sl:MoveFromId( listId)

Syntax terms

sl	A Stringlist object.
listId	The $list identifier of the $list from which data is to be moved.

Usage notes

• All errors in MoveFromId result in request cancellation.
• After MovefromId is invoked, the source $list will be emptied, although the $list identifier is still valid.
• MoveFromId discards any current contents of the method stringlist.
• MoveFromId copies to the method stringlist any image association that is set via $listimg.
• MoveFromid simply moves the internal $list data pointers to the object stringlist. It does not actually perform any data movement; therefore, it is extremely efficient.
• MoveFromid is intended to facilitate migration to stringlists of existing applications that use $lists.
• stringlists should always be used in preference to $lists, so MoveFromId is provided only for the migration of existing $list applications to the use of Stringlists.

Examples

1. Suppose complex subroutine Summarize takes a $list identifier as its input parameter. Further suppose that the subroutine is rewritten to use Stringlists rather than $list. The following code illustrates how this can be accomplished:

   subroutine summarize(%listId is float) %list is object stringList %list = new %list:moveFromid(%listId) ...

   %list:moveToid(%listId) return

   Of course, if the subroutine "forgets" to restore the input $list contents with MoveToId, the input $list remains empty at the end of the subroutine.

See also

• MoveToId which does the converse (move Stringlist data into a $list)

Stringlist class	List of Stringlist methods	Stringlist methods syntax
Notation conventions for methods