On Fri, May 4, 2012 at 6:33 AM, Andrew Holden wrote: On Thursday, May 03, 2012 2:42 PM, Richard wrote: boost-users@lists.boost.org spake the secret code
<1D97E025367AFB4A8C528590A3715BF442603A@archerysummit2.willamette.charte
roaksystems.com> thusly: static void Internal_callback (XtPointer self, XtIntervalId*)
{
reinterpret_cast I don't know why people always leap to reinterpret_cast<> as their
first choice; it's the most dangerous. I'd prefer static_cast<> here. In this case, the reinterpret_cast is needed because X11 specified that
your callback *must* take a void pointer. Reinterpret_cast and the old
c-style cast (which would act as a reinterpret_cast in this case) are
the only ways I know to convert a void pointer to the correct type. In
this case, I mitigated the danger by making Internal_callback private
and ensuring the only place where it is used--the public Schedule
function--provides a pointer of the correct type. Sorry, drifting off-topic, and I'm not sure what XtPointer is, but based on
your comment above, it seems it is a void pointer, and you can indeed
static_cast a void pointer to any other (object) pointer type (as long as
you don't drop cv qualifiers).
- Jeff