Casting NULL?
dvadura at watdaisy.UUCP
dvadura at watdaisy.UUCP
Sat Jan 24 00:27:31 AEST 1987
In article <3179 at brl-adm.ARPA> Peter Steele - Acadia writes:
>I have a question about pointers: I just recently read
>a C text where whenever NULL was passed as a parameter
>it was casted to the proper type.
>
>He claimed that
>this is required because pointers to different types of objects
>may not be the same size.
I don't know how common it is, but a simple solution is to define:
#define NIL(a) (a *)NULL;
when you need to pass a null pointer to an int or a char then say
NIL( int ) or NIL( char )
this works for structs and other objects as well.
typedef foo { .... } BAR;
then NIL( BAR ) is a NULL pointer of type BAR.
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