# This file is part of Hypothesis, which may be found at
# https://github.com/HypothesisWorks/hypothesis/
#
# Copyright the Hypothesis Authors.
# Individual contributors are listed in AUTHORS.rst and the git log.
#
# This Source Code Form is subject to the terms of the Mozilla Public License,
# v. 2.0. If a copy of the MPL was not distributed with this file, You can
# obtain one at https://mozilla.org/MPL/2.0/.


class UniqueIdentifier:
    """A factory for sentinel objects with nice reprs."""

    def __init__(self, identifier):
        self.identifier = identifier

    def __repr__(self):
        return self.identifier


class InferType(UniqueIdentifier):
    """We have a subclass for `infer` so we can type-hint public APIs."""


infer = InferType("infer")
not_set = UniqueIdentifier("not_set")
