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  1. Qt
  2. QTBUG-116079

As a user of Qt, I expect qfloat16 construction to be constexpr

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    • User Story
    • Resolution: Out of scope
    • P2: Important
    • None
    • None
    • Core: Containers and Algorithms
    • None
    • c86cf385d (dev), 2d4db1bff (6.5), 3a9bbf235 (6.6)

    Description

      ... but it isn't:

      contexpr qfloat16 f16 = 42.f; // ERROR: not a constant expression

      I realize that the conversion depends on some tables, but if consteval or std::is_constant_evaluated() may allow to have an alternative implementation that is constexpr. Maybe an algorithmic one that would be too slow for runtime?

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          relates to

          Task - A task that needs to be done. QTBUG-108341 Add support for std::numbers::e_v<qfloat16> etc

          • P2: Important - Urgent, should be fixed, but will not stop the release.
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              thiago Thiago Macieira
              mmutz Marc Mutz
              Vladimir Minenko Vladimir Minenko
              Alex Blasche Alex Blasche
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