zignis / bit-roles

🔐 Granular role and permission management based on bit flags

Bit Roles

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() }; }

Getting started

Add bit_roles to your project:

cargo add bit_roles

Usage

You 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.