Source code for pytket.backends.backend_exceptions

# Copyright Quantinuum
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from .resulthandle import ResultHandle




class CircuitNotValidError(Exception):
    """Raised when a submitted circuit does not satisfy all predicates"""

    def __init__(self, message: str | int, failed_pred: str | None = None):
        if isinstance(message, int):
            message = (
                "Circuit with index {} in submitted does not satisfy "
                "{} (try compiling with backend.get_compiled_circuits first)."
            ).format(message, failed_pred or "all predicates")
        super().__init__(message)





class CircuitNotRunError(Exception):
    """Raised when a result is retrieved corresponding to a handle that has not been
    executed"""

    def __init__(self, handle: ResultHandle):
        super().__init__(
            f"Circuit corresponding to {handle!r} "
            "has not been run by this backend instance."
        )





class InvalidResultType(Exception):
    """Raised when a BackendResult instance cannot produce the required result type."""

    def __init__(self, result_type: str):
        super().__init__(f"BackendResult cannot produce result of type {result_type}.")