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  1. Qt
  2. QTBUG-105467

Impact of C++20 atomics on our code

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    • Epic
    • Resolution: Unresolved
    • P2: Important
    • None
    • None
    • Core: Threads
    • None
    • C++20 atomics @ Qt

    Description

      C++20 beefed up std::atomic quite a bit to the point where it's overtaken QAtomics in features.

      The effect on Qt APIs is simply to put even more pressure now on moving from QAtomic to std::atomic (QTBUG-103833).

      As for implementation, we need to review our std::atomic use for the issues mentioned in https://wg21.link/P0883 (defined(__cpp_lib_atomic_value_initialization)), incl, since ATOMIC_VAR_INIT is now deprecated, a Qt wrapper to retain compatibility between C++17 and C++20 code without running into C++20 deprecation warnings.

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          Epic - Created by Jira Software - do not edit or delete. Issue type for a big user story that needs to be broken down. QTBUG-99243 Initiative: Qt and C++20

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Open

          User Story - Created by Jira Software - do not edit or delete. Issue type for a user story. QTBUG-109361 C++20 is required for the development and building of Qt itself (Phase II)

          • Not Evaluated - Not yet evaluated/prioritized
          • Open

          User Story - Created by Jira Software - do not edit or delete. Issue type for a user story. QTBUG-109363 Long term C++ plans post C++20

          • Not Evaluated - Not yet evaluated/prioritized
          • Open
          relates to

          Epic - Created by Jira Software - do not edit or delete. Issue type for a big user story that needs to be broken down. QTBUG-103833 Remove QAtomic*

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Open

          Epic - Created by Jira Software - do not edit or delete. Issue type for a big user story that needs to be broken down. QTBUG-108781 Impact of C++20 multi-threading library additions on our code

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Open
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              cnn Qt Core & Network
              mmutz Marc Mutz
              Vladimir Minenko Vladimir Minenko
              Alex Blasche Alex Blasche
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                Created:
                Updated:

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