[TUHS] C question for the historians

Arthur Krewat krewat at kilonet.net
Thu Nov 9 02:17:40 AEST 2017


 From a mailing list I belong to, a back-and-forth is going on that I am 
not involved in. The following sums it up nicely:

> It's really the implied equality that's the problem.  For example:
> 
>     if (flags & DLADM_OPT_PERSIST) {
> 
> would be better written as:
> 
>     if ((flags & DLADM_OPT_PERSIST) == 0) {



Seriously? What do (or would) "original C" programmers think of this? To me, anything non-zero is "true" so the first is perfectly acceptable.

The original assertion in the discussion was that the following is not "right" because of the mixing of bitwise and boolean.

> if ((flags & DLADM_OPT_PERSIST) && (link_flags & DLMGMT_PERSIST)) {

art k.



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