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"""Use C-extensions from asecext.
This module defines a decorator that can be used to replace pure Python
functions with faster C-implementations from the ase_ext module.
"""
import functools
try:
import ase_ext
except ImportError:
ase_ext = None
def cextension(func):
if ase_ext is None:
return func
cfunc = getattr(ase_ext, func.__name__, None)
if cfunc is None:
return func
functools.update_wrapper(cfunc, func)
cfunc.__pure_python_function__ = func
return cfunc
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