function pointer help needed

[Ron Natalie <ron>]

In article <592 at elrond.UUCP>, amamaral at elrond.UUCP (Alan Amaral) writes:
 > In article <1327 at loral.UUCP>, jlh at loral.UUCP (Jim Vaxkiller) writes:
 > Here is one way:
 > 
 > void				/* 2 do nothing routines returning */
 > err0()				/*    different data types */
 > {printf("testing 123\n");}
 > 
 > int
 > err1()
 > {}
 > 
 > void (*ptr_tbl[2])();		/* table of 2 function pointers */
 > 
 > void init()
 > {
 >     ptr_tbl[0] = err0;
 > }

WARNING WARNING...DANGER DANGER...RUN, WILL ROBINSON, RUN!

Gak...don't do this.  While most compilers will treat this OK since the
place where an "int" is returned is generally considered scratch before
a funcion is called, this is NOT PORTABLE, and will break most compilers
if err0 returned something large like a structure.

The linkage of a subroutine is dependant on the value it returns.  Casting
it into a pointer to a function returning a different type is asking for
trouble.

-Ron