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Boxiang Sun
cython
Commits
679551b3
Commit
679551b3
authored
Jun 26, 2018
by
gabrieldemarmiesse
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Added an example of using python strings with const memoryviews.
parent
084a25f5
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docs/examples/userguide/memoryviews/view_string.pyx
docs/examples/userguide/memoryviews/view_string.pyx
+9
-0
docs/src/userguide/memoryviews.rst
docs/src/userguide/memoryviews.rst
+5
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docs/examples/userguide/memoryviews/view_string.pyx
0 → 100644
View file @
679551b3
cdef
bint
is_y_in
(
const
unsigned
char
[:]
string_view
):
cdef
int
i
for
i
in
range
(
string_view
.
shape
[
0
]):
if
string_view
[
i
]
==
b'y'
:
return
True
return
False
print
(
is_y_in
(
b'hello world'
))
# False
print
(
is_y_in
(
b'hello Cython'
))
# True
docs/src/userguide/memoryviews.rst
View file @
679551b3
...
@@ -186,6 +186,11 @@ support read-only buffers as input::
...
@@ -186,6 +186,11 @@ support read-only buffers as input::
a.setflags(write=False)
a.setflags(write=False)
myslice = a
myslice = a
Using a non-const memoryview with a binary Python string produces a runtime error.
You can solve this issue with a ``const`` memoryview:
.. literalinclude:: ../../examples/userguide/memoryviews/view_string.pyx
Note that this does not *require* the input buffer to be read-only::
Note that this does not *require* the input buffer to be read-only::
a = np.linspace(0, 10, num=50)
a = np.linspace(0, 10, num=50)
...
...
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