Trait UrnScheme 

pub trait UrnScheme:
    Copy
    + Clone
    + PartialEq
    + Eq
    + Hash
    + PartialOrd
    + Ord
    + Debug
    + 'static {
    const TASK_PREFIX: &'static str;
    const TREE_PREFIX: &'static str;
    const VALIDATED: () = _;
}

The URN namespace an application mints its task identities under.

This crate mints no namespace of its own: every crate::TaskId and crate::TaskTreeId is parameterized by a scheme the application defines once, so identities from different systems can never be confused and no third party can mint another application’s URNs by accident.

Implement it on a unit struct with trivial derives:

use tasktree::UrnScheme;

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
struct ExampleUrn;

impl UrnScheme for ExampleUrn {
    const TASK_PREFIX: &'static str = "urn:example:task:";
    const TREE_PREFIX: &'static str = "urn:example:task-tree:";
}

Both prefixes are validated at compile time when the scheme is first used: non-empty, ASCII graphic, ending in :, and distinct from each other.

Required Associated Constants

const TASK_PREFIX: &'static str

The prefix of a task URN, e.g. urn:example:task:.

const TREE_PREFIX: &'static str

The prefix of a task-tree URN, e.g. urn:example:task-tree:.

Provided Associated Constants

const VALIDATED: () = _

Compile-time prefix validation. Do not override; constructors evaluate it once per scheme.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors