proposal for the EnumSet template

[ghost]

proposal for the EnumSet template

An EnumSet allows to create a bitfield using the members of an enum, whatever is the members type or the members values. In other languages this is often used to define a set of options, easily identifiable in the code.

This proposal contains a comprehensive template that covers the concept in a D flavor

• type safety: constraints.
• efficiency: the set is packed in a value type that's efficient to use as parameter (e.g as ref)
• inclusion, exclusion, constructor using several parameter kinds, input range to iterate the members that are included and much more.
• well tested.

Code, it's part of a bigger library. It's kept in sync with this PR.
Doc, rendered with harbored.

[quickfur]

Isn't this what std.typecons.BitFlags already does?

[ghost]

It's related but EnumSet if focused on enum.

Try to reproduce the EnumSet example with BitFlag and you'll see.

[ghost]

EnumSet passes all the tests. Time to review.

[dnadlinger]

@bbasile: Unrelated, but the b.asile Skype account, which I assume is you, keeps sending me spam links. Is one of your systems/accounts maybe compromised?

[DmitryOlshansky]

An EnumSet allows to create a bitfield using the members of an enum, whatever is the members type or the members values. In other languages this is often used to define a set of options, easily identifiable in the code.

Truth be told it looks like small bitset (fits in one ubyte, ushort, uint ...) with slots labeled by enum members.