Add test_ctypes/_support.py

This partially backports be89ee5
(python#113727)

Co-authored-by: Erlend E. Aasland <[email protected]>

Author: 2 people

Lib/test/test_ctypes/_support.py

@@ -0,0 +1,24 @@
+# Some classes and types are not export to _ctypes module directly.
+
+import ctypes
+from _ctypes import Structure, Union, _Pointer, Array, _SimpleCData, CFuncPtr
+
+
+_CData = Structure.__base__
+assert _CData.__name__ == "_CData"
+
+class _X(Structure):
+    _fields_ = [("x", ctypes.c_int)]
+CField = type(_X.x)
+
+# metaclasses
+PyCStructType = type(Structure)
+UnionType = type(Union)
+PyCPointerType = type(_Pointer)
+PyCArrayType = type(Array)
+PyCSimpleType = type(_SimpleCData)
+PyCFuncPtrType = type(CFuncPtr)
+
+# type flags
+Py_TPFLAGS_DISALLOW_INSTANTIATION = 1 << 7
+Py_TPFLAGS_IMMUTABLETYPE = 1 << 8