def test_pointer_identity(self):
from _ffi import types
x = types.Pointer(types.slong)
y = types.Pointer(types.slong)
z = types.Pointer(types.char)
assert x is y
assert x is not z
def test_typed_pointer(self):
from _ffi import types
intptr = types.Pointer(types.sint) # create a typed pointer to sint
assert intptr.deref_pointer() is types.sint
assert str(intptr) == '<ffi type (pointer to sint)>'
assert types.sint.deref_pointer() is None
raises(TypeError, "types.Pointer(42)")
def test_typed_pointer_args(self):
"""
extern int dummy; // defined in test_void_result
DLLEXPORT int* get_dummy_ptr(); // defined in test_pointer_args
DLLEXPORT void set_val_to_ptr(int* ptr, int val); // ditto
"""
from _ffi import CDLL, types
libfoo = CDLL(self.libfoo_name)
intptr = types.Pointer(types.sint)
get_dummy = libfoo.getfunc('get_dummy', [], types.sint)
get_dummy_ptr = libfoo.getfunc('get_dummy_ptr', [], intptr)
set_val_to_ptr = libfoo.getfunc('set_val_to_ptr', [intptr, types.sint],
types.void)
assert get_dummy() == 0
ptr = get_dummy_ptr()
set_val_to_ptr(ptr, 123)
assert get_dummy() == 123
set_val_to_ptr(ptr, 0)
def test_char_p_cached(self):
from _ffi import types
x = types.Pointer(types.char)
assert x is types.char_p
x = types.Pointer(types.unichar)
assert x is types.unichar_p