GPOEP - Offset Element Pointer

Purpose

Use GPOEP to move the element pointer to a new element relative to the current element pointer.

This subroutine adds the pointer offset value to the element pointer. The value can either be positive, which moves the element pointer forward, or negative, which moves the element pointer backward. If the resultant value is less than zero, then the element pointer defaults to a value of zero. If the resultant value is greater than the number of elements in the open structure, then the graPHIGS API sets the pointer to point to the last element.

Parameters