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Type Buffer's flags argument #648

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Merged
merged 1 commit into from
Nov 18, 2024
Merged

Type Buffer's flags argument #648

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2 changes: 1 addition & 1 deletion numcodecs/compat_ext.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,7 @@ from .compat import ensure_contiguous_ndarray
cdef class Buffer:
"""Convenience class for buffer interface."""

def __cinit__(self, obj, flags):
def __cinit__(self, obj, int flags):
PyObject_GetBuffer(obj, &(self.buffer), flags)
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@jakirkham jakirkham Nov 18, 2024 •
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The flags argument here is only used in this PyObject_GetBuffer call. The signature of this function in Cython or in Python is

int PyObject_GetBuffer(object obj, Py_buffer *view, int flags)

Here flags is an int specified by a range of possible constants to provide a specific kind of Py_buffer object

To make sure that flags can be passed through unaltered to this function call, this types the __cinit__ arguments to match

Without this typing, Cython will convert values to Python objects first and then convert them back in this constructor (a needless exercise). This change will fix that issue going forward

self.acquired = True
self.ptr = <char *> self.buffer.buf
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