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# BSD 3-Clause License; see https://github.com/scikit-hep/awkward/blob/main/LICENSE
from __future__ import annotations
import packaging.version
_has_checked_version = False
def register_and_check():
global _has_checked_version
try:
import cppyy
except ImportError as err:
raise ImportError(
"""install the 'cppyy' package with:
pip install cppyy
or
conda install -c conda-forge cppyy
Note that this must be in a different venv or conda environment from ROOT, if you have installed ROOT.
"""
) from err
if not _has_checked_version:
if packaging.version.Version(cppyy.__version__) < packaging.version.Version(
"3.1.0"
):
raise ImportError(
"Awkward Array can only work with cppyy 3.1.0 or later "
f"(you have version {cppyy.__version__})"
)
_has_checked_version = True
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