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from __future__ import print_function, division, absolute_import

import numba
from numba.core import types
from numba.core.typing import signature
from numba.core.typing.templates import infer_global, AbstractTemplate
from numba.extending import lower_builtin


@infer_global(bool)
class BoolNoneTyper(AbstractTemplate):
    def generic(self, args, kws):
        assert not kws
        assert len(args) == 1
        val_t = args[0]
        if val_t == types.none:
            return signature(types.boolean, *args)


@lower_builtin(bool, types.none)
def lower_column_mean_impl(context, builder, sig, args):
    res = context.compile_internal(builder, lambda a: False, sig, args)
    return res  # impl_ret_untracked(context, builder, sig.return_type, res)
