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  1. Qt
  2. QTBUG-76025 Specify the QML language and write a QML-to-C++ compiler
  3. QTBUG-112487

qmlsc: Propagate values through temporary arrays

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      Code

      import QtQuick

Window {
    width: 640
    height: 480
    visible: true

    property list<int> numbers

    function foo(): int {
        let jsArray = [1, 2, 3]
        numbers = jsArray
        return jsArray[0]
    }
}

       

      Compiler output

      Error: main.qml:11:9: Could not compile function foo: Cannot generate efficient code for storing an array in a non-sequence type
        let jsArray = [1, 2, 3]
        ^^^

       

      Workaround
      qmlsc doesn't seem to complain if we assign a strongly-typed QML list to a JS variable (although I'm not sure if the code was simply optimized away):

          property list<int> numbers
    function foo(): int {
        numbers = [1, 2, 3]
        let jsArray = numbers
        return jsArray[0]
    }

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            qtqmlteam Qt Qml Team User
            skoh-qt Sze Howe Koh
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              Created:
              Updated:

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