cypclass type inference unit test

nogil_test/cypclass_test_type_inference.pyx

+cdef cypclass SomeMemory:
+  int a
+
+  void __init__(self, int a=0):
+    self.a = a
+
+  SomeMemory __add__(self, SomeMemory other):
+    return SomeMemory(self.a + other.a)
+
+  SomeMemory __iadd__(self, SomeMemory other):
+    self.a += other.a
+
+  SomeMemory __mul__(self, SomeMemory other):
+    return SomeMemory(self.a * other.a)
+
+cdef cypclass SomeSubMemory(SomeMemory):
+  int b
+
+cpdef bag():
+  o1 = SomeMemory()
+  o2 = SomeMemory(4)
+  o3 = SomeSubMemory(3)
+
+  o3 += o2
+  o1 = o2 * o3
+  return str(o1.a) + '\n' + str(o2.a) + '\n' + str(o3.a)

nogil_test/cypclass_test_type_inference_distutil.py

+from distutils.core import setup
+from distutils.extension import Extension
+from Cython.Build import cythonize
+
+setup(
+    ext_modules = cythonize([
+        Extension(
+            'cypclass_test_type_inference',
+            language='c++',
+            sources=['cypclass_test_type_inference.pyx'],
+            extra_compile_args=["-pthread", "-std=c++11"],
+        ),
+    ])
+)
+