I saw in QtAssistant that QDataStream supports QMap and QMultiMap inherits QMap . Does Qt support QMultiMap for serialization with QDataStream ?
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I haven't tried it, but it should. QMultiMap doesn't fundamentally change anything about QMap. Even a regular QMap can handle multiple values with the same key. QMultiMap just provides a few extra convenience functions.
I'd also note that the documentation doesn't mention anything about any incompatabilities, even claiming that