FUNCTION-POINTER phrase

The FUNCTION-POINTER phrase defines an item as a function-pointer data item. A function-pointer data item can contain the address of a procedure entry point.

A function-pointer is a 4-byte elementary item or an 8-byte elementary item depending on whether the ADDR(32) or ADDR(64) compiler option is in effect. Function-pointers have the same capabilities as procedure-pointers. Function-pointers are easily interoperable with C function pointers.

A function-pointer can contain one of the following addresses or can contain NULL:

A VALUE clause for a function-pointer data item can contain only NULL or NULLS.

A function-pointer can be used in the same contexts as a procedure-pointer, as defined in PROCEDURE-POINTER phrase.