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# distutils: language = c++
from cpython cimport Py_buffer
from libcpp.vector cimport vector
cdef class Matrix:
cdef int view_count
cdef Py_ssize_t ncols
cdef vector[float] v
# ...
def __cinit__(self, Py_ssize_t ncols):
self.ncols = ncols
self.view_count = 0
def add_row(self):
if self.view_count > 0:
raise ValueError("can't add row while being viewed")
self.v.resize(self.v.size() + self.ncols)
def __getbuffer__(self, Py_buffer *buffer, int flags):
# ... as before
self.view_count += 1
def __releasebuffer__(self, Py_buffer *buffer):
self.view_count -= 1
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