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# mode: run
# tag: readonly, const, numpy
# ticket: 1772
import numpy as np
cimport cython
def new_array(dtype='float', writeable=True):
array = np.arange(10, dtype=dtype)
array.setflags(write=writeable)
return array
ARRAY = new_array()
cdef getmax(const double[:] x):
"""Example code, should work with both ro and rw memoryviews"""
cdef double max_val = -float('inf')
for val in x:
if val > max_val:
max_val = val
return max_val
cdef update_array(double [:] x):
"""Modifying a ro memoryview should raise an error"""
x[0] = 23.
cdef getconst(const double [:] x):
"""Should accept ro memoryviews"""
return x[0]
def test_mmview_rw(x):
"""
>>> test_mmview_rw(ARRAY)
9.0
"""
return getmax(x)
def test_mmview_ro(x):
"""
>>> test_mmview_ro(new_array())
9.0
"""
x.setflags(write=False)
assert x.flags.writeable is False
return getmax(x)
def test_update_mmview_rw(x):
"""
>>> float(test_update_mmview_rw(new_array()))
23.0
"""
update_array(x)
return x[0]
def test_update_mmview_ro(x):
"""
>>> test_update_mmview_ro(new_array())
0.0
"""
x.setflags(write=False)
assert x.flags.writeable is False
try:
update_array(x)
except ValueError: pass
else:
assert False, "RO error not raised!"
return getconst(x)
def test_rw_call_getmax(double[:] x):
"""
>>> test_rw_call_getmax(new_array())
23.0
"""
update_array(x)
assert getconst(x) == 23
return getmax(x)
def test_const_mmview_ro(x):
"""
>>> test_const_mmview_ro(new_array())
0.0
"""
x.setflags(write=False)
assert x.flags.writeable is False
return getconst(x)
def test_two_views(x):
"""
>>> test_two_views(new_array())
23.0
"""
cdef double[:] rw = x
cdef const double[:] ro = rw
rw[0] = 23
return ro[0]
def test_assign_ro_to_rw(x):
"""
>>> test_assign_ro_to_rw(new_array())
2.0
"""
cdef const double[:] ro = x
cdef double[:] rw = np.empty_like(ro)
rw[:] = ro
return rw[2]
def test_copy():
"""
>>> test_copy()
(1.0, 2.0, 1.0, 1.0, 1.0, 2.0)
"""
cdef const double[:] ro = np.ones(3)
cdef const double[:] ro2 = ro.copy()
cdef double[:] rw = ro.copy()
cdef double[:] rw2 = ro2.copy()
rw[1] = 2
rw2[2] = 2
return rw[0], rw[1], rw[2], rw2[0], rw2[1], rw2[2]
cdef getmax_floating(const cython.floating[:] x):
"""Function with fused type, should work with both ro and rw memoryviews"""
cdef cython.floating max_val = - float('inf')
for val in x:
if val > max_val:
max_val = val
return max_val
def test_mmview_const_fused_cdef():
"""Test cdef function with const fused type memory view as argument.
>>> test_mmview_const_fused_cdef()
"""
cdef float[:] data_rw = new_array(dtype='float32')
assert getmax_floating(data_rw) == 9
cdef const float[:] data_ro = new_array(dtype='float32', writeable=False)
assert getmax_floating(data_ro) == 9
def test_mmview_const_fused_def(const cython.floating[:] x):
"""Test def function with const fused type memory view as argument.
With read-write numpy array:
>>> test_mmview_const_fused_def(new_array('float32', writeable=True))
0.0
>>> test_mmview_const_fused_def(new_array('float64', writeable=True))
0.0
With read-only numpy array:
>>> test_mmview_const_fused_def(new_array('float32', writeable=False))
0.0
>>> test_mmview_const_fused_def(new_array('float64', writeable=False))
0.0
"""
cdef cython.floating result = x[0]
return result
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