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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
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