Editing items of a QList
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I am working on module to support adding, editing, and removing data to an xml file using Chapter 9 as an example http://www.digitalfanatics.org/projects/qt_tutorial/chapter09.html. I have made a change to the code by replacing QValueList with QList. A problem I am running into is that I am getting an error indicating
bq. /mnt/hgfs/work/Projects/ART-build-desktop/../ART/snippetbrowser.cpp:122: error: passing ‘const QString’ as ‘this’ argument of ‘QString& QString::operator=(const QString&)’ discards qualifiers
My editing code snippet is as follow:
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void snippetBrowser::editSnippet()
{
Contact c = m_contacts.at(currentRow());editor->contact.name = c.name; editor->contact.eMail = c.eMail; editor->contact.phone = c.phone; if (editor->exec() == QDialog::Accepted) { m_contacts.at(currentRow()).name = editor->contact.name; m_contacts.at(currentRow()).eMail = editor->contact.eMail; m_contacts.at(currentRow()).phone = editor->contact.phone; setItem(currentRow(), 0, new QTableWidgetItem(m_contacts.at(currentRow()).name)); setItem(currentRow(), 1, new QTableWidgetItem(m_contacts.at(currentRow()).phone)); }
}
@There error seem to be @ line 11-13. How can edit the item of a QList???
Thank you for your time and consideration. -
You should use operator [] instead of at() in this case as it returns constant reference to the item.
@m_contacts [currentRow()].name = editor->contact.name;@
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On non-const lists, operator returns a reference to the item and can be used on the left side of an assignment.
For read-only access, an alternative syntax is to use at() which is faster than operator, because it never causes a deep copy to occur.
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const T & at ( int i ) const
T & operator[] ( int i )
const T & operator[] ( int i ) const
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thank you to both responses!!!