Example of how to convert std::vector of doubles to memviews and back using Cython

vector_conversion_example.pyx

from libcpp.vector cimport vector

cdef convert_memview_to_vector(double[::1] &mem):
  cdef vector[double] arr
  arr.reserve(mem.shape[0])
  for i in mem:
    arr.push_back(i)
  return arr
  
cdef convert_vector_to_memview(vector[double] &vec):
  cdef double[::1] mem = <double[:vec.size()]> &vec[0]
  return mem