[cppyy] cast to long long pointer result in unsigned long long pointer #21431
Description
Check duplicate issues.
- Checked for duplicates
Description
Casting an int64 numpy array into a signed long long pointer gives an unsigned long long pointer instead.
Reproducer
import cppyy
import cppyy.ll
import numpy as np
arr = np.array([-1, 0, 1], dtype=np.int64)
view = cppyy.ll.cast[f"long long*"](arr.ctypes.data)
# prints 18446744073709551615 instead of -1
print(view[0])
# prints 'L' instead of 'l'
print(view.typecode)
ROOT version
cppyy==3.5.0
Installation method
conda (bundled with root)
Operating system
Linux
Additional context
No response