New #[pyclass] system that is aware of its concrete layout

CHANGELOG.md

@@ -11,15 +11,21 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 * The blanket implementations for `FromPyObject` for `&T` and `&mut T` are no longer specializable. Implement `PyTryFrom` for your type to control the behavior of `FromPyObject::extract()` for your types.
 * The implementation for `IntoPy<U> for T` where `U: FromPy<T>` is no longer specializable. Control the behavior of this via the implementation of `FromPy`.
+* `#[new]` does not take `PyRawObject` and can reutrn `Self`  [#683](https://github.com/PyO3/pyo3/pull/683)
 
 ### Added
 
 * Implemented `IntoIterator` for `PySet` and `PyFrozenSet`. [#716](https://github.com/PyO3/pyo3/pull/716)
+* `PyClass`, `PyClassShell`, `PyObjectLayout`, `PyClassInitializer` [#683](https://github.com/PyO3/pyo3/pull/683)
 
 ### Fixed
 
 * Clear error indicator when the exception is handled on the Rust side. [#719](https://github.com/PyO3/pyo3/pull/719)
 
+### Removed
+
+* `PyRef`, `PyRefMut`, `PyRawObject` [#683](https://github.com/PyO3/pyo3/pull/683)
+
 ## [0.8.5]
 
 * Support for `#[name = "foo"]` attribute for `#[pyfunction]` and in `#[pymethods]`. [#692](https://github.com/PyO3/pyo3/pull/692)

examples/rustapi_module/src/buf_and_str.rs

@@ -9,8 +9,8 @@ struct BytesExtractor {}
 #[pymethods]
 impl BytesExtractor {
     #[new]
-    pub fn __new__(obj: &PyRawObject) {
-        obj.init({ BytesExtractor {} });
+    pub fn __new__() -> Self {
+        BytesExtractor {}
     }
 
     pub fn from_bytes(&mut self, bytes: &PyBytes) -> PyResult<usize> {

examples/rustapi_module/src/datetime.rs

@@ -195,8 +195,8 @@ pub struct TzClass {}
 #[pymethods]
 impl TzClass {
     #[new]
-    fn new(obj: &PyRawObject) {
-        obj.init(TzClass {})
+    fn new() -> Self {
+        TzClass {}
     }
 
     fn utcoffset<'p>(&self, py: Python<'p>, _dt: &PyDateTime) -> PyResult<&'p PyDelta> {

examples/rustapi_module/src/dict_iter.rs

@@ -16,8 +16,8 @@ pub struct DictSize {
 #[pymethods]
 impl DictSize {
     #[new]
-    fn new(obj: &PyRawObject, expected: u32) {
-        obj.init(DictSize { expected })
+    fn new(expected: u32) -> Self {
+        DictSize { expected }
     }
 
     fn iter_dict(&mut self, _py: Python<'_>, dict: &PyDict) -> PyResult<u32> {

examples/rustapi_module/src/othermod.rs

@@ -13,10 +13,10 @@ pub struct ModClass {
 #[pymethods]
 impl ModClass {
     #[new]
-    fn new(obj: &PyRawObject) {
-        obj.init(ModClass {
+    fn new() -> Self {
+        ModClass {
             _somefield: String::from("contents"),
-        })
+        }
     }
 
     fn noop(&self, x: usize) -> usize {

examples/rustapi_module/src/subclassing.rs

@@ -8,8 +8,8 @@ pub struct Subclassable {}
 #[pymethods]
 impl Subclassable {
     #[new]
-    fn new(obj: &PyRawObject) {
-        obj.init(Subclassable {});
+    fn new() -> Self {
+        Subclassable {}
     }
 }
 

examples/word-count/src/lib.rs

@@ -16,10 +16,10 @@ struct WordCounter {
 #[pymethods]
 impl WordCounter {
     #[new]
-    fn new(obj: &PyRawObject, path: String) {
-        obj.init(WordCounter {
+    fn new(path: String) -> Self {
+        WordCounter {
             path: PathBuf::from(path),
-        });
+        }
     }
 
     /// Searches for the word, parallelized by rayon