is custom Struct used as param of connect efficient? pass by value, not pointer, because signal and slot are not in the same thread
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is custom Struct used as param of connect effiecnt?pass by value, not pointer, because signal and slot are not in the same thread
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Yes, why not? Unless it is some huge behemoth, CPU will handle parameter copying without an issue.
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Hi,
Depending on its content and use you can make it implicitly shared using QSharedDataPointer and thus make the "read only" copy faster.
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@SGaist actually the non-mainThread is respond for get the data from the internet, and mainThread is read the data and show it in Qt-ui.
so QSharedDataPointer is much faster and precice than pass-by value?why QMetaObject::invokeMethod pass custom-type called Twice custom-type's copy constructor...
https://forum.qt.io/topic/102915/qmetaobject-invokemethod-pass-custom-type-called-twice-custom-type-s-copy-constructor
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As already written by @sierdzio, it's about the size of your object. If speed is that critical for you, then benchmark your code.
