37 lines
1.4 KiB
Python
37 lines
1.4 KiB
Python
# -*- coding: utf-8 -*-
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"""Type aliases allowing to narrow down definition and reduce duplication
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This file is part of PyVISA.
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:copyright: 2020-2022 by PyVISA Authors, see AUTHORS for more details.
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:license: MIT, see LICENSE for more details.
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"""
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from typing import Any, Callable, NewType
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from . import constants
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#: Type alias used to identify VISA resource manager sessions
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VISARMSession = NewType("VISARMSession", int)
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#: Type alias used to identify VISA resource sessions
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VISASession = NewType("VISASession", int)
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#: Type alias used to identify an event context (created when handling an event)
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VISAEventContext = NewType("VISAEventContext", int)
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#: Type alias used to identify a job id created during an asynchronous operation
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#: JobID should always be treated as opaque objects since their exact behavior
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#: may depend on the backend in use.
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VISAJobID = NewType("VISAJobID", object)
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#: Type alias used to identify a memory address in a register based resource after
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#: it has been mapped
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VISAMemoryAddress = NewType("VISAMemoryAddress", int)
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#: Type for event handler passed to the VISA library. The last argument is the
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#: user handle specified when registering the handler. The value that will be
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#: passed to the handler is the value as interpreted by the backend and returned
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#: by the install_visa_handler method of the library object.
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VISAHandler = Callable[[VISASession, constants.EventType, VISAEventContext, Any], None]
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