Passing plain text to function general question

In standard C++, the following code is passed as the actual data when used as a parameter:

Code:

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m_ui->myTextField()->toPlainText()

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Does Qt pass the actual data or the reference/address ?

Something like the reference because the type of the returned data is a QString which is implicitely shared. See http://qt.nokia.com/doc/4.5/shared.html

Yeah, that's what I thought.

Remember that Qt is also "standard C++".