On Sunday, 17 April 2022 at 18:25:32 UTC, Bastiaan Veelo wrote:
On Saturday, 16 April 2022 at 11:39:01 UTC, Manfred Nowak wrote:
In the specs(17) about enums the word "integral" has no match.
But because the default basetype is `int`, which is an
integral type, enums might be integral types whenever their
basetype is an integral type.
The reason is in [17.1.5](https://dlang.org/spec/enum.html):
“EnumBaseType types cannot be implicitly cast to an enum type.”
The 'integral' or numeric value is used for uniqueness, not for
math or some other effect, anymore than a primary int key in a
SQL database is used to identify someone's birthday. (*Maybe
that's the wrong analogy, comparing apples to oranges perhaps*).
We will indeed have to explicitly cast to get around it, though
it doesn't mean much. If you have say true=1, blue=2, what is
blue+true? Numerically it's 3 but there's no value 3, or value 3
could be say potato...
Few years ago i made an enum type flag/library storage library,
which would take an int and convert to N flags, or N flags to an
int for compactly storing said values. But it's been quite a
while, though i do recall a lot of casting and binary
AND/OR/XOR's involved for it to work the way it was intended.
