This crate enables you to implement granular role and permission management based on bit flags.
| Using discrete fields | Using bit roles |
|---|---|
#[derive(Debug)]
struct User {
can_send_message: bool,
can_edit_message: bool
}
fn main() {
let user = User {
can_send_message: true,
can_edit_message: false
};
} |
use bit_roles::BitRole;
#[derive(Debug)]
struct User {
permissions: usize
}
#[derive(Debug, BitRole, Copy, Clone)]
enum Permission {
None = 0,
SendMessage = 1,
EditMessage = 2,
}
fn main() {
let mut permissions = Permission::empty();
permissions.add_one(Permission::SendMessage);
let user = User {
permissions: permissions.get_value()
};
} |
Add bit_roles to your project:
cargo add bit_rolsYou can derive the BitRole trait for your role enum. It ensures compile-time validation for enum discriminants. Ensure
you specify a discriminant for every enum variant; it must be either zero or a power of two. Also, remember to derive
the Copy and Clone traits for your enum.
If you need a manager without compile-time checks, it's also exported as BitRoleUnchecked trait. This is useful if you
want to use raw integer values for roles or have a complex role enum definition. You will need to implement
the Into<usize> trait for your role enum, along with deriving the Copy and Clone traits for it.