Method setdefault_entry

crates/vm/src/dict_inner.rs:550–584

(
        &self,
        vm: &VirtualMachine,
        key: &K,
        default: F,
    )

    #[allow(dead_code)]
    pub fn setdefault_entry<K, F>(
        &self,
        vm: &VirtualMachine,
        key: &K,
        default: F,
    ) -> PyResult<(PyObjectRef, T)>
    where
        K: DictKey + ?Sized,
        F: FnOnce() -> T,
    {
        let hash = key.key_hash(vm)?;
        let mut default = Some(default);
        loop {
            let (index_entry, index_index) = self.lookup(vm, key, hash, None)?;
            if let Some(index) = index_entry.index() {
                let inner = self.read();
                if let Some(entry) = inner.get_entry_checked(index, index_index) {
                    return Ok((entry.key.clone(), entry.value.clone()));
                }
                continue;
            }
            let mut inner = self.write();
            if inner.indices.get(index_index) != Some(&index_entry) {
                continue;
            }
            let value = default
                .take()
                .expect("default must only be computed on insertion")();
            let key_obj = key.to_pyobject(vm);
            let ret = (key_obj.clone(), value.clone());
            inner.unchecked_push(index_index, hash, key_obj, value, index_entry);
            self.bump_version();
            return Ok(ret);
        }
    }

    pub fn len(&self) -> usize {
        self.read().used