set-count in snip%

Sets the snip's count (i.e., the number of items within the snip).

The snip's count may be changed by the system (in extreme cases to maintain consistency) without calling this method.

• (send a-snip set-count c) -> void
     c : exact integer in [1, 100000]

  Sets the snip's count (i.e., the number of items in the snip), and notifies the snip's administrator that the snip's size has changed.