Use optional::emplace() instead of assignment from an rvalue. Saves the move constructor and destructor calls, both of which are not trivial (due to cleanFn). Change-Id: Ief77626c77d0c8c2ce17e3b1a21496a7da969761 Reviewed-by: Juha Vuolle <juha.vuolle@qt.io> (cherry picked from commit 063e31209b1750b6cbd2c3f57c49ce372b13a91a) Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
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