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  1. Qt
  2. QTBUG-104154

Impact of C++20 aggregate init with parentheses on our code

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    • Epic
    • Resolution: Unresolved
    • P3: Somewhat important
    • None
    • None
    • Core: Other
    • None
    • C++20 aggregate-init @ Qt

    Description

      C++20 solved the problem that the likes of std::make_unique and std::make_shared cannot be used to create a non-default-constructed aggregate, because they use new T(~~~) when aggregates need new T{~~}. They solved it by allowing aggregate initialization to use parentheses instead of braces, such that new T(~~~) compiles even when T is an aggregate.

      Once we can depend on C++20, I expect more classes to become simple structs as a result of this change, CTAD for aggregates (QTBUG-104152) and designated initializers (QTBUG-104153).

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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
          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-104153 Impact of C++20 designated initializers on our code

          • 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-104152 Impact of C++20 CTAD on our code

          • P4: Low - Would be nice to fix, but it's not very important.
          • Open
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              cnn Qt Core & Network
              mmutz Marc Mutz
              Vladimir Minenko Vladimir Minenko
              Alex Blasche Alex Blasche
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