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  1. Qt
  2. QTBUG-141420

qmlcachegen: calling func(obj) clones obj instead of passing it by ref

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      The following code fails if cachegen compiles the function bugTest():

      Window {
  id: window
  visible: true

  function foo(data: var) : void {
    data.count = 1
  }

  function check(data : var) : void {
    console.info("check", data.count === 1 ? "ok" : "fail")
  }

  function bugTest() : void {
    const data = ({})
    foo(data)
    check(data)
    // console.info(data.count) // uncomment to disable cachegen
  }

  Component.onCompleted: bugTest()
}

      For some reason the object 'data' is cloned (CoW?) during the foo() function call. The expected behavior is that it is passed by reference.

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            qtqmlteam Qt Qml Team User
            pdegoeje Pieter de Goeje
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              Created:
              Updated:

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