Limit the intern! macro to strings and intern the string contents in addition to the reference.
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@ -15,7 +15,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
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- Added methods on `InterpreterConfig` to run Python scripts using the configured executable. [#2092](https://github.com/PyO3/pyo3/pull/2092)
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- Added FFI definitions for `PyType_FromModuleAndSpec`, `PyType_GetModule`, `PyType_GetModuleState` and `PyModule_AddType`. [#2250](https://github.com/PyO3/pyo3/pull/2250)
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- Add `PyString::intern` to enable usage of the Python's built-in string interning. [#2268](https://github.com/PyO3/pyo3/pull/2268)
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- Add `intern!` macro which can be used to amortize the cost of creating Python objects by storing them inside a `GILOnceCell`. [#2269](https://github.com/PyO3/pyo3/pull/2269)
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- Add `intern!` macro which can be used to amortize the cost of creating Python strings by storing them inside a `GILOnceCell`. [#2269](https://github.com/PyO3/pyo3/pull/2269)
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### Changed
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@ -111,12 +111,11 @@ impl<T> GILOnceCell<T> {
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}
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}
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/// Converts `value` into a Python object and stores it in static storage. The same Python object
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/// is returned on each invocation.
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/// Interns `text` as a Python string and stores a reference to it in static storage.
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///
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/// Because it is stored in a static, this object's destructor will not run.
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/// A reference to the same Python string is returned on each invocation.
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///
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/// # Example: Using `intern!` to avoid needlessly recreating the same object
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/// # Example: Using `intern!` to avoid needlessly recreating the same Python string
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///
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/// ```
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/// use pyo3::intern;
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@ -126,7 +125,7 @@ impl<T> GILOnceCell<T> {
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/// fn create_dict(py: Python<'_>) -> PyResult<&PyDict> {
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/// let dict = PyDict::new(py);
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/// // 👇 A new `PyString` is created
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/// // for every call of this function
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/// // for every call of this function.
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/// dict.set_item("foo", 42)?;
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/// Ok(dict)
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/// }
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@ -142,14 +141,12 @@ impl<T> GILOnceCell<T> {
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/// ```
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#[macro_export]
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macro_rules! intern {
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($py: expr, $value: expr) => {{
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static INTERNED: $crate::once_cell::GILOnceCell<$crate::PyObject> =
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($py: expr, $text: literal) => {{
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static INTERNED: $crate::once_cell::GILOnceCell<$crate::Py<$crate::types::PyString>> =
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$crate::once_cell::GILOnceCell::new();
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INTERNED
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.get_or_init($py, || {
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$crate::conversion::ToPyObject::to_object($value, $py)
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})
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.get_or_init($py, || $crate::types::PyString::intern($py, $text).into())
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.as_ref($py)
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}};
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}
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