python - Cython, confusion regarding the vector (size) constructor -

it seems way define vector variable

cdef std::vector[int]* vec=new vector[int](<size>)

am correct in thinking this? here's sample code, if compile , run python crashes @ end (vs2015, python 3.5).

from libcpp.vector cimport vector def test():     cdef vector[int]* vec = new vector[int](5)     cdef int     in range(5):         print(vec[i])      del vec 

i want have 2 dimensional vector, size. how this? be:

cdef std::vector[std::vector[int]]* vec=new vector[vector[int](<size1>)](<size2>)

although official examples show how create stuff on heap, reason, it's not necessary. code builds:

from libcpp.vector cimport vector                                                                                                                                                                             ctypedef vector[int] int_vec                                                         ctypedef vector[int_vec] int_vec_vec                                                   def test():                                                                              cdef int_vec v                                                                       v = int_vec(5)                                                                        cdef int_vec_ve vv                                                                   vv = int_vec_vec(5, v)    

it builds 5x5 vector of int vectors.