Merging changes to volatile bitfield structs

[John (Eljay) Love-Jensen]

Hi Phil,

Hmmm, try this...

struct S
{
  unsigned a : 1;
  unsigned b : 31;
};

volatile S s;

void f()
{
  S x;
  x.a = 0;
  x.b = 0;
  S& nonvolatile_s = const_cast<S&>(s);
  nonvolatile_s = x;
}

If you are using C++ anyway, I strongly recommend avoiding bitfields and do the shifting/masking in accessor/mutator functions yourself.  That'll help encapsulation, too.

--Eljay