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POCan not convert from inherited class "No suitable constructor exists to convert from "QStandardItem *" to "FolderItem""
 

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  1. POCan not convert from inherited class "No suitable constructor exists to convert from "QStandardItem *" to "FolderItem""
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    <p>Hi I am in the process of trying to impliment subclass of the qt library supplied QStandardItemModel and QStandardItem to display items in a Qtreeview. Everything seems to work fine except for when I try to retrieve the selected object from the tree view and use it as a parent object to add children too. The issue is that the selected object retrieves as the inherited type "QStandardItem" and not my subtype "FolderItem":</p> <pre><code>FolderItem KSLgui::GetSelectedFolder() { QItemSelectionModel * model = ui.folderView-&gt;selectionModel(); QModelIndexList indexes = model-&gt;selectedIndexes(); return (FolderItem)folderModel.itemFromIndex(indexes.first()); } </code></pre> <p>I get an error telling me that no sutible constructor exists to convert from the two types. I have overloaded all the constructors for both types when making my subtypes and tried to make a new constructor that excepts QStandardItem as a parameter which appears to fix the error but doesn't function properly as it only returns an empty object and not the selected object:</p> <pre><code>FolderItem::FolderItem() : QStandardItem() { } FolderItem::FolderItem(const std::string &amp; text) : QStandardItem(QString::fromStdString(text)) { } FolderItem::FolderItem(const QIcon &amp; icon, const QString &amp; text) : QStandardItem(icon, text) { } FolderItem::FolderItem( int rows, int columns) : QStandardItem(rows, columns) { } /* returns empty FolderItem::FolderItem(QStandardItem * stanitem) { } */ FolderItem::~FolderItem() { } int FolderItem::type() const { return 1001; } FolderStructureModel::FolderStructureModel(QObject *parent) : QStandardItemModel(parent) { } </code></pre> <p>I have included what I beleive to be the significant code.</p>
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    1. USkkuryllo
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    1. COSorry I seem to have solved the issue myself. I had to cast to the right type of point I believe. I am not getting an access violation however... but it's a step in the right direction.
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      1. POCan not convert from inherited class "No suitable constructor exists to convert from "QStandardItem *" to "FolderItem""
      1. USkkuryllo
    2. COBetter don't use C-Style casts - they are unsafe. Better use static_cast. (FolderItem)...itemFromIndex(...) is wrong, as a QStandardItem* (pointer) is returned, but you return a FolderItem object. You should return a FolderItem* and use static_cast (if you're sure about the type).
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      1. POCan not convert from inherited class "No suitable constructor exists to convert from "QStandardItem *" to "FolderItem""
      1. USFrank Osterfeld
 

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