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  1. Qt
  2. QTBUG-27391

Warning generated when using QImage as QtConcurrent::mapped return type

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Details

    • Bug
    • Resolution: Done
    • P2: Important
    • 5.0.0
    • 5.0.0 Beta 1, 5.0.0 Beta 2, 5.0.0 RC 1
    • Core: Threads
    • None
    • OS X 10.7.5, clang 3.1
    • e3b78896d21000c759ccc1e2781a471327307710

    Description

      QImage scaled(QImage & i) { return i; }

void main()
{
    QList<QImage> images;
    QList<QImage> future = QtConcurrent::blockingMapped(images, scaled);
}

      Compiling the above code generates the following warning:

      In file included from /Qt/5.0/qtbase/include/QtCore/qvector.h:1:
/Qt/5.0/qtbase/include/QtCore/../../src/corelib/tools/qvector.h:459:56: warning: source of this 'memcpy' call is a pointer to dynamic class 'QImage'; vtable pointer will be copied [-Wdynamic-class-memaccess]
                    ::memcpy(static_cast<void *>(dst), srcBegin, (srcEnd - srcBegin) * sizeof(T));
                    ~~~~~~~~                           ^

      QImage is treated as a POD type and memcpy is used to copy the data.

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            liaqi Liang Qi
            stephenju Stephen Chu
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            Dates

              Created:
              Updated:
              Resolved:

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