https://gcc.gnu.org/bugzilla/show_bug.cgi?id=39170
Albi <albrecht.guendel at web dot de> changed:
What |Removed |Added
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CC| |albrecht.guendel at web dot de
--- Comment #16 from Albi <albrecht.guendel at web dot de> ---
Here is a type safe C++ solution:
template<unsigned int N, typename T> union NBitValueUnion
{
static_assert((sizeof(T)*8) > N, "Strange Bitfield Width");
private:
const T Data;
public:
struct
{
const T Value : N;
const T : (sizeof(T)*8-N);
};
NBitValueUnion(const T& _Data): Data(_Data) {}
};
template<unsigned int N, typename T> const NBitValueUnion<N, T> NBitValue(const
T& _Data)
{ return NBitValueUnion<N, T>(_Data); }
Usage:
Bitfield.Member = VariableName; //Triggers -Wconversion
Bitfield.Member = NBitValue<FieldWidth>(VariableName).Value; //Silent.
Unfortnunately it triggers -Waggregate-return (which is a topic for it self
since its a type thats fits in a register, so its an aggregate.. but not in
hardware.)
Any improvements are welcome.
