I have a question on usage of BitFlags, described here:
https://dlang.org/library/std/typecons/bit_flags.html
and/or on bitop
https://dlang.org/phobos/core_bitop.html#.bsf
A similar example to the bit flags example is given here:
[code]
import std.typecons;
enum Rs : ubyte
{
None,
s_f = 1 << 0,
s_s = 1 << 1,
s_p = 1 << 2,
t_f = 1 << 3,
t_s = 1 << 4,
t_p = 1 << 5
}
struct R
{
import core.bitop : popcnt;
invariant {/* some useful asserts here */}
this(ubyte val)
{
assert(popcnt(cast(uint)val) == 2); // separate asserts...
r |= cast(BitFlags!Rs)val; // line 20 ... from asignment
}
BitFlags!Rs r;
alias r this;
}
void main(){}
[/code]
ok, now: the idea is that if I use the functionality of bit
flags, then I can take advantage of bit operations. And I'm
looking for the inverse operation of converting a bit flag to its
raw value, like the line before last in the example on the bit
flags documentation site.
How should my line 20 looks like to achieve an assignment of a
raw value to a BitFlags variable in a single step?
