BUG: use memory view for indexer in take_2d / tests (GH10043)

doc/source/whatsnew/v0.16.1.txt

@@ -255,7 +255,7 @@ Bug Fixes
 - Bug where ``TimdeltaIndex`` were not properly serialized in fixed ``HDFStore`` (:issue:`9635`)
 - Bug with ``TimedeltaIndex`` constructor ignoring ``name`` when given another ``TimedeltaIndex`` as data (:issue:`10025`).
 - Bug in ``DataFrameFormatter._get_formatted_index`` with not applying ``max_colwidth`` to the ``DataFrame`` index (:issue:`7856`)
-
+- Bug in ``.loc`` with a read-only ndarray data source (:issue:`10043`)
 - Bug in ``groupby.apply()`` that would raise if a passed user defined function either returned only ``None`` (for all input). (:issue:`9685`)
 
 - Bug in plotting continuously using ``secondary_y`` may not show legend properly. (:issue:`9610`, :issue:`9779`)

pandas/src/generate_code.py

@@ -139,7 +139,7 @@ def take_1d_%(name)s_%(dest)s(ndarray[%(c_type_in)s] values,
 @cython.wraparound(False)
 @cython.boundscheck(False)
 cdef inline take_2d_axis0_%(name)s_%(dest)s_memview(%(c_type_in)s[:, :] values,
-                                                    ndarray[int64_t] indexer,
+                                                    int64_t[:] indexer,
                                                     %(c_type_out)s[:, :] out,
                                                     fill_value=np.nan):
 """ + inner_take_2d_axis0_template + """
@@ -188,7 +188,7 @@ def take_2d_axis0_%(name)s_%(dest)s(ndarray[%(c_type_in)s, ndim=2] values,
 @cython.wraparound(False)
 @cython.boundscheck(False)
 cdef inline take_2d_axis1_%(name)s_%(dest)s_memview(%(c_type_in)s[:, :] values,
-                                                    ndarray[int64_t] indexer,
+                                                    int64_t[:] indexer,
                                                     %(c_type_out)s[:, :] out,
                                                     fill_value=np.nan):
 """ + inner_take_2d_axis1_template + """