Minor fix to work right for "none" fields. Already worked fine on
combination fields liek "all".
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enum Foo
{
none = 0,
optionA = 1<<0,
optionB = 1<<1,
optionC = 1<<2,
optionD = 1<<3,
all = optionA | optionB | optionC | optionD,
}
import std.traits : isIntegral;
auto bitFieldValues(T)(T value) if(is(T==enum) && isIntegral!T)
{
// There's gotta be a better way to convert EnumMembers!T
// to a range, right? But std.range.only() didn't work,
// due to a template instantiation error.
T[] members;
foreach(m; EnumMembers!(T))
members ~= m;
return members
.filter!(member => member==0? value==0 : (value&member)==member)
.map!(member => to!string(member));
}
void main()
{
import std.range : join;
import std.stdio : writeln;
Foo fooVar = Foo.optionB | Foo.optionD;
// Output:
// optionB | optionD
// none
// optionA | optionB | optionC | optionD | all
writeln(bitFieldValues(Foo.optionB | Foo.optionD).join(" | "));
writeln(bitFieldValues(Foo.none).join(" | "));
writeln(bitFieldValues(Foo.all).join(" | "));
}
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