relmath-rs 0.3.0

Relation-first mathematics and scientific computing in Rust.
Documentation 
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//! Role-based access control with relational composition and image.

use relmath::{BinaryRelation, UnaryRelation};

fn main() {
    let user_role = BinaryRelation::from_pairs([
        ("ann", "admin"),
        ("bob", "analyst"),
        ("bob", "reviewer"),
        ("cara", "guest"),
    ]);

    let role_permission = BinaryRelation::from_pairs([
        ("admin", "read"),
        ("admin", "write"),
        ("admin", "deploy"),
        ("analyst", "read"),
        ("reviewer", "approve"),
        ("guest", "read"),
    ]);

    let effective_permission = user_role.compose(&role_permission);
    let bob = UnaryRelation::singleton("bob");
    let bob_permissions = effective_permission.image(&bob);

    assert!(effective_permission.contains(&"ann", &"deploy"));
    assert!(bob_permissions.contains(&"approve"));
    assert!(bob_permissions.contains(&"read"));

    println!(
        "effective permissions for bob: {:?}",
        bob_permissions.to_vec()
    );
}