Is this good enough?
alias Bitv48 = BitVector!48;
ulong ull;
auto foo = ull.toBitV!Bitv48;
Where toBitV is a little function of yours.
Hello Bearophile
As I put in the earlier post, in general the functioning of "to"
in std.conv seems to be that it will not cast away bits.
ull.to!int actually throws an exception:
std.conv.ConvOverflowException@/../../src/phobos/std/conv.d(1432):
Conversion positive overflow
And so I do not want to code a toBitV that casts away bits.
What I am doing at the moment is:
alias BitV48 = BitVector!48;
ulong ull;
BitV48 bits = cast(Bit48) ull.toBitVector;
Here toBitVector converts any long to BitVector!64, and int to
BitVector!32 and so on. And since an explicit cast is required,
the user knows that he is *cast*ing away bits.
Still my point is that I would like BitVector!48 to behave as
much native as it could be. And I miss a provision to cast
directly from long. If we could have opCastRight (actually
opCastLeft), such issues could be taken care of.
One of the strengths of DLang is that it is a systems programming
language. But at places I find that D does lack some capabilities
to create native-like value types.
Regards
- Cherry
