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  1. Qt
  2. QTBUG-105467

Impact of C++20 atomics on our code

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    • Epic
    • Status: Open
    • P2: Important
    • Resolution: Unresolved
    • None
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    • Core: Threads
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    • 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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              cnn Qt Core & Network
              mmutz Marc Mutz
              Vladimir Minenko Vladimir Minenko
              Alex Blasche Alex Blasche
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                Updated:

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