comparison rust/hg-cpython/src/dirstate/dirs_multiset.rs @ 43422:b9f791090211

rust-cpython: rename PyLeakedRef to PyLeaked

This series will make PyLeaked* behave more like a Python iterator, which
means mutation of the owner object will be allowed and the leaked reference
(i.e. the iterator) will be invalidated instead.

I'll add PyLeakedRef/PyLeakedRefMut structs which will represent a "borrowed"
state, and prevent the underlying value from being mutably borrowed while the
leaked reference is in use:

  let shared = self.inner_shared(py);
  let leaked = shared.leak_immutable();
  {
      let leaked_ref: PyLeakedRef<_> = leaked.borrow(py);
      shared.borrow_mut();  // panics since the underlying value is borrowed
  }
  shared.borrow_mut();  // allowed

The relation between PyLeaked* structs is quite similar to RefCell/Ref/RefMut,
but the implementation can't be reused because the borrowing state will have
to be shared across objects having no lifetime relation.

PyLeaked isn't named as PyLeakedCell since it isn't actually a cell in that
leaked.borrow_mut() will require &mut self.

43305:d782cce137fd

    exc, ObjectProtocol, PyBytes, PyClone, PyDict, PyErr, PyObject, PyResult,
    Python,
};

use crate::dirstate::extract_dirstate;
use crate::ref_sharing::{PyLeakedRef, PySharedRefCell};
use hg::{
    utils::hg_path::{HgPath, HgPathBuf},
    DirsMultiset, DirsMultisetIter, DirstateMapError, DirstateParseError,
    EntryState,
};

    }
}

py_shared_iterator!(
    DirsMultisetKeysIterator,
    PyLeakedRef<DirsMultisetIter<'static>>,
    Dirs::translate_key,
    Option<PyBytes>
);

43422:b9f791090211

    exc, ObjectProtocol, PyBytes, PyClone, PyDict, PyErr, PyObject, PyResult,
    Python,
};

use crate::dirstate::extract_dirstate;
use crate::ref_sharing::{PyLeaked, PySharedRefCell};
use hg::{
    utils::hg_path::{HgPath, HgPathBuf},
    DirsMultiset, DirsMultisetIter, DirstateMapError, DirstateParseError,
    EntryState,
};

    }
}

py_shared_iterator!(
    DirsMultisetKeysIterator,
    PyLeaked<DirsMultisetIter<'static>>,
    Dirs::translate_key,
    Option<PyBytes>
);