is custom Struct used as param of connect efficient? pass by value, not pointer, because signal and slot are not in the same thread

[opengpu]

is custom Struct used as param of connect effiecnt?pass by value, not pointer, because signal and slot are not in the same thread

[sierdzio]

Yes, why not? Unless it is some huge behemoth, CPU will handle parameter copying without an issue.

[SGaist]

Hi,

Depending on its content and use you can make it implicitly shared using QSharedDataPointer and thus make the "read only" copy faster.

[opengpu]

@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

[SGaist]

As already written by @sierdzio, it's about the size of your object. If speed is that critical for you, then benchmark your code.