Advance a pointer by sizeof(struct) for a struct member in an array of struct

struct_member_ptr.pyx

%%cython

# cython: wraparound=False
# cython: boundscheck=False
# cython: cdivision=True
# cython: nonecheck=False
# cython: profile=False

cimport numpy as np
import numpy as np

# Type for pointer addresses
from libc.stdint cimport uintptr_t

cdef struct Foo:
    short a
    # short e
    # int a
    # double d
    double b
    size_t c
    
cdef Foo[5] foos

cdef double* member_ptr

member_ptr = <double*> (&foos[0].b)
print(<uintptr_t>member_ptr)

cdef int i

# convert from bits to bytes for addition...
cdef uintptr_t size_of_Foo = sizeof(Foo) / 8

print(size_of_Foo)

for i in range(5):
    member_ptr[0] = i + 10
    member_ptr += size_of_Foo
    
print(foos)