Ultra fast setting vertices locations of Blender mesh in Python, faster than foreach_set

fast_foreach_set_vertices.py

import numpy as np
import ctypes


def fast_foreach_set_vertices(mesh: bpy.types.Mesh, array: NDArray):
    # Ultra fast vertices setting
    # Thanks a ton!: https://blender.stackexchange.com/a/298488/53664
    # beware all things could go wrong here!
    assert array.dtype == np.float32
    assert len(array.shape) == 1
    assert array.strides[0] == 4  # sizeof(float)
    assert array.flags.c_contiguous and array.flags.aligned
    assert array.nbytes == array.shape[0] * array.strides[0]
    ptr = mesh.vertices[0].as_pointer()
    ptr_as_float = ctypes.cast(ptr, ctypes.POINTER(ctypes.c_float))
    ctypes.memmove(ptr_as_float, array.ctypes.data, array.nbytes)