ATTRIBUTES ALLOW_NULL

The ATTRIBUTES directive option ALLOW_NULL enables a corresponding dummy argument to pass a NULL pointer (defined by a zero or the NULL intrinsic) by value for the argument. It takes the following form:

構文

cDEC$ ATTRIBUTES ALLOW_NULL :: arg

c

Is one of the following: C (or c), !, or *. (See Syntax Rules for Compiler Directives.)

arg

Is the name of the argument.

ALLOW_NULL is only valid if the REFERENCE option is also specified; otherwise, it has no effect.

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