Re: Casting the return value of ...

Kaz Kylheku <433-929-6894@kylheku.com> writes:
[...]

Conversions between function pointers and data pointers are an
extension; it is not well-defined behavior in ISO C.
>
Therefore we can neither say that ISO C doesn't require a cast there (it
imposes no requirements at all), nor that the conversion is fine with a
cast.
>
The cast is /likely/ necessary, in order to correctly trigger the
extension.

ISO C does require a cast.  The cast is necessary to avoid a constraint
violation and a mandatory diagnostic.  The resulting behavior is
undefined in ISO C, but defined by POSIX.

Assigning a void* value to a pointer-to-function object without a cast
violates the constraint for simple assignment (N1570 6.5.16.1p1).

[...]

--
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
Working, but not speaking, for Medtronic
void Void(void) { Void(); } /* The recursive call of the void */