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# distutils: language = c++
from cython.cimports.cpython import Py_buffer
from cython.cimports.libcpp.vector import vector
@cython.cclass
class Matrix:
view_count: cython.int
ncols: cython.Py_ssize_t
v: vector[cython.float]
# ...
def __cinit__(self, ncols: cython.Py_ssize_t):
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, buffer: cython.pointer[Py_buffer], flags: cython.int):
# ... as before
self.view_count += 1
def __releasebuffer__(self, buffer: cython.pointer[Py_buffer]):
self.view_count -= 1
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