X 6.1.6.4.4 Procedure-Pointer Data Items
X Only EQUAL and NOT EQUAL are allowed as relational operators when
X specifying procedure-pointer data items. Procedure-pointer data items are
X items defined explicitly as USAGE IS PROCEDURE-POINTER.
X The operands are equal if the two addresses used in the comparison would
X both result in the same storage location.
X This relation condition is allowed in IF, PERFORM, EVALUATE, and SEARCH
X Format 1 statements. It is not allowed in SEARCH Format 2 (SEARCH ALL)
X statements, because there is no meaningful ordering that can be applied to
X procedure-pointer data items.
X ___ Format 3 ___________________________________________________________ X | | X | >>__ ______________ __ ____ __ _____ __ _EQUAL__ ____ _ _____________> | X | |_identifier-1_| |_IS_| |_NOT_| | |_TO_| | | X | |_NULL_________| |_=_____________| | X | |_NULLS________| | | | X | >__ ______________ _________________________________________________>< | X | |_identifier-2_| | X | |_NULL_________| | X | |_NULLS________| | | | |________________________________________________________________________|
X identifier-1
X identifier-2
X Must be described as USAGE IS PROCEDURE-POINTER.
X NULL(S)
X As in this syntax diagram, can be used only if the other operand is
X defined as USAGE IS PROCEDURE-POINTER. That is, NULL=NULL is not
X allowed.
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