python - how can I use cython memoryview on numpy bool array? -

i used bool array quite often. in cython also. however, cannot make new memoryview interface working on numpy bool matrix.

here test:

def test_oldbuffer_uint8(np.ndarray[np.uint8_t, ndim=2] input):     cdef size_t i, j     cdef long total = 0     cdef size_t j = input.shape[0]     cdef size_t = input.shape[1]     j in range(j):         in range(i):             total +=input[i, j]     return total   def test_memview_uint8(np.uint8_t[:,:] input):     cdef size_t i, j     cdef long total = 0     cdef size_t j = input.shape[0]     cdef size_t = input.shape[1]     j in range(j):         in range(i):             total +=input[i, j]     return total   def test_oldbuffer_bool(np.ndarray[np.uint8_t, ndim=2, cast=true] input):     cdef size_t i, j     cdef long total = 0     cdef size_t j = input.shape[0]     cdef size_t = input.shape[1]     j in range(j):         in range(i):             total +=input[i, j]     return total   cpython cimport bool def test_memview_bool(bool[:,:] input):     cdef size_t i, j     cdef long total = 0     cdef size_t j = input.shape[0]     cdef size_t = input.shape[1]     j in range(j):         in range(i):             total +=input[i, j]     return total 

then pass random boolean array them:

def test_memview():     import fuzedtest1     = np.random.randn(10000,10000)     = a>0     sum = a.sum()     b = a.astype(np.uint8)     funcs = [         (fuzedtest1.test_oldbuffer_uint8, b),         (fuzedtest1.test_memview_uint8, b),         (fuzedtest1.test_oldbuffer_bool, a),         (fuzedtest1.test_memview_bool, a),      ]     _func, _arr in funcs:         try:             _sum = _func(_arr)             t = timeit.timeit(lambda : _func(_arr), number=10)             print("{} time = {}, res = {} _sum = {}".format(_func, t, _sum, sum))         except exception err:             print(err) 

the result this:

<built-in function test_oldbuffer_uint8> time = 1.4905898699998943, res = 50000391 _sum = 50000391 <built-in function test_memview_uint8> time = 1.483763039999758, res = 50000391 _sum = 50000391 <built-in function test_oldbuffer_bool> time = 1.488173633999395, res = 50000391 _sum = 50000391 not understand character buffer dtype format string ('?') 

how can cast=true in memoryview context?

wiki