Identifier: null

Type

generic

Description

This value is a general constant used to nullify any identifiers. Any identifier type may be assigned a null value. Its effect will vary depending on the identifier, e.g.

• alias - Set to "".

• atable - Error - invalid assignment.

• blob - Set to an empty blob.

• channel - chan0 (undefined).

• color - Set to undefined.

• component - Set to obj0 (undefined).

• compound - Set all members to null.

• cursor - Set to undefined.

• database - Error - invalid assignment.

• dbstructure - Set all members to null.

• entity - Kill the entity, retaining the identifier.

• epointer - Make the identifier point to nothing.

• fillstyle - Set to a no fill.

• filter - An empty filter.

• font - Set to undefined.

• grid - Error - invalid assignment.

• group - Remove all members.

• gstructure - Set all members to null, kill the graphics.

• hatchstyle - Set to undefined.

• layer - Set to undefined.

• linestyle - Set to undefined.

• markerstyle - Set to undefined.

• menupane - Set to undefined.

• numeric - Set to 0.

• panel - Set to undefined.

• point - Set to (0,0,0).

• projection - Set to undefined.

• stanza - Set to "".

• string - Set to "".

• structure - Set all members to null.

• textstyle - Set to undefined.

• tile - Set to undefined.

• time - Set to 0 ticks, i.e. the epoch 1/1/1970.

• treenode - Set to tn0 (undefined).

• window - Set to win0 (undefined).