Implement ToPyObject for all PythonObjects.

src/conversion.rs

@@ -75,36 +75,6 @@ pub trait FromPyObject<'p> {
     fn from_py_object(s: &PyObject<'p>) -> PyResult<'p, Self>;
 }
 
-// PyObject, PyModule etc.
-// We support FromPyObject and ToPyObject for owned python references.
-// This allows using existing Python objects in code that generically expects a value
-// convertible to a Python object.
-
-/// Identity conversion: allows using existing `PyObject` instances where
-/// `ToPyObject` is expected.
-impl <'p, 's> ToPyObject<'p> for PyObject<'s> {
-    type ObjectType = PyObject<'p>;
-
-    #[inline]
-    fn to_py_object(&self, py: Python<'p>) -> PyObject<'p> {
-        self.clone().into_py_object(py)
-    }
-
-    #[inline]
-    fn into_py_object(self, _py: Python<'p>) -> PyObject<'p> {
-        // Transmute the lifetime.
-        // This is safe, because both lifetime variables represent the same lifetime:
-        // that of the python GIL acquisition.
-        unsafe { std::mem::transmute(self) }
-    }
-
-    #[inline]
-    fn with_borrowed_ptr<F, R>(&self, _py: Python<'p>, f: F) -> R
-      where F: FnOnce(*mut ffi::PyObject) -> R {
-        f(self.as_ptr())
-    }
-}
-
 impl <'p, T> FromPyObject<'p> for T where T: PythonObjectWithCheckedDowncast<'p> {
     #[inline]
     fn from_py_object(s : &PyObject<'p>) -> PyResult<'p, T> {
@@ -112,10 +82,7 @@ impl <'p, T> FromPyObject<'p> for T where T: PythonObjectWithCheckedDowncast<'p>
     }
 }
 
-// &PyObject, &PyModule etc.
-// We support FromPyObject and ToPyObject for borrowed python references.
-// This allows using existing Python objects in code that generically expects a value
-// convertible to a Python object.
+// ToPyObject for references
 impl <'p, 's, T: ?Sized> ToPyObject<'p> for &'s T where T: ToPyObject<'p> {
     type ObjectType = T::ObjectType;
 

src/objects/mod.rs

@@ -39,6 +39,35 @@ pub use self::num::PyInt;
 pub use self::num::PyLong as PyInt;
 pub use self::num::{PyLong, PyFloat};
 
+/// Identity conversion: allows using existing `PyObject` instances where
+/// `T: ToPyObject` is expected.
+macro_rules! pyobject_to_pyobject(
+    ($name: ident) => (
+        impl <'p, 's> ::conversion::ToPyObject<'p> for $name<'s> {
+            type ObjectType = $name<'p>;
+
+            #[inline]
+            fn to_py_object(&self, py: Python<'p>) -> $name<'p> {
+                self.clone().into_py_object(py)
+            }
+
+            #[inline]
+            fn into_py_object(self, _py: Python<'p>) -> $name<'p> {
+                // Transmute the lifetime.
+                // This is safe, because both lifetime variables represent the same lifetime:
+                // that of the python GIL acquisition.
+                unsafe { ::std::mem::transmute(self) }
+            }
+
+            #[inline]
+            fn with_borrowed_ptr<F, R>(&self, _py: Python<'p>, f: F) -> R
+              where F: FnOnce(*mut ffi::PyObject) -> R {
+                f(self.as_ptr())
+            }
+        }
+    )
+);
+
 macro_rules! pyobject_newtype(
     ($name: ident) => (
         /// Clone returns another reference to the Python object,
@@ -50,6 +79,8 @@ macro_rules! pyobject_newtype(
             }
         }
 
+        pyobject_to_pyobject!($name);
+
         impl <'p> ::python::PythonObject<'p> for $name<'p> {
             #[inline]
             fn as_object(&self) -> &::objects::object::PyObject<'p> {
@@ -74,6 +105,11 @@ macro_rules! pyobject_newtype(
             unsafe fn unchecked_downcast_borrow_from<'a>(obj: &'a ::objects::object::PyObject<'p>) -> &'a Self {
                 ::std::mem::transmute(obj)
             }
+
+            #[inline]
+            fn python(&self) -> Python<'p> {
+                self.0.python()
+            }
         }
     );
     ($name: ident, $checkfunction: ident) => (

src/objects/object.rs

@@ -69,6 +69,8 @@ impl <'p> Clone for PyObject<'p> {
     }
 }
 
+pyobject_to_pyobject!(PyObject);
+
 impl <'p> PythonObject<'p> for PyObject<'p> {
     #[inline]
     fn as_object<'a>(&'a self) -> &'a PyObject<'p> {

src/python.rs

@@ -46,7 +46,7 @@ pub trait ToPythonPointer {
 }
 
 /// Trait implemented by all Python object types.
-pub trait PythonObject<'p> : 'p + Clone {
+pub trait PythonObject<'p> : 'p + Clone + ::conversion::ToPyObject<'p> {
     /// Casts the Python object to PyObject.
     fn as_object(&self) -> &PyObject<'p>;
 

src/rustobject/mod.rs

@@ -233,6 +233,26 @@ impl <'p, T> Clone for PyRustType<'p, T> where T: 'p + Send {
     }
 }
 
+impl <'p, 's, T> ToPyObject<'p> for PyRustType<'s, T> where T: 's + Send {
+    type ObjectType = PyType<'p>;
+
+    #[inline]
+    fn to_py_object(&self, py: Python<'p>) -> PyType<'p> {
+        self.type_obj.to_py_object(py)
+    }
+
+    #[inline]
+    fn into_py_object(self, py: Python<'p>) -> PyType<'p> {
+        self.type_obj.into_py_object(py)
+    }
+
+    #[inline]
+    fn with_borrowed_ptr<F, R>(&self, _py: Python<'p>, f: F) -> R
+      where F: FnOnce(*mut ffi::PyObject) -> R {
+        f(self.as_ptr())
+    }
+}
+
 impl <'p, T> PythonObject<'p> for PyRustType<'p, T> where T: 'p + Send {
     #[inline]
     fn as_object(&self) -> &PyObject<'p> {