NULLIFY
Purpose
The NULLIFY statement causes pointers to become disassociated.
Syntax
Rules
A pointer_object must be definable and have the POINTER attribute.
A pointer_object must not depend on the value, bounds, or association status of another pointer_object in the same NULLIFY statement.
Tip:
Always initialize a pointer with the NULLIFY statement, pointer assignment, default initialization or explicit initialization.
Examples
TYPE T
INTEGER CELL
TYPE(T), POINTER :: NEXT
ENDTYPE T
TYPE(T) HEAD, TAIL
TARGET :: TAIL
HEAD%NEXT => TAIL
NULLIFY (TAIL%NEXT)
END