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//! Code here is based on crochet's implementation - see
//! [here](https://github.com/raphlinus/crochet/blob/master/src/key.rs) for more details!
use std::hash::Hash;
use std::panic::Location;
/// A newtype around [`Location`].
#[derive(Clone, Copy, Hash, Debug, PartialEq, Eq, PartialOrd, Ord)]
pub struct Caller(&'static Location<'static>);
impl From<&'static Location<'static>> for Caller {
fn from(location: &'static Location<'static>) -> Self {
Caller(location)
}
}
/// A unique key built around using the [`Location`] given by
/// `#[track_caller]` and a sequence index.
#[derive(Clone, Copy, Hash, Debug, PartialEq, Eq, PartialOrd, Ord)]
pub struct Key {
pub(crate) caller: Caller,
pub(crate) index: usize,
}
impl Key {
pub fn new(caller: impl Into<Caller>, index: usize) -> Self {
Self {
caller: caller.into(),
index,
}
}
}
#[derive(Default, Clone, Copy, Debug)]
pub struct KeyCreator {
index: usize,
}
impl KeyCreator {
pub fn new_key(&mut self, caller: impl Into<Caller>) -> Key {
self.index += 1;
Key::new(caller, self.index)
}
pub fn reset(&mut self) {
self.index = 0;
}
}
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