Why does passing a QObject-derived object by value fail?

QM • Qt Forum member • September 11, 2026 • 1 answers

A developer passed an object derived from QObject by value to another C++ function and encountered a copy-related compiler error.

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Dheerendra V Purohit

September 11, 2026 • Independent answer

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Dheerendra explained that QObject disables copying, so a QObject-derived instance should not be passed by value. Use a reference or pointer depending on the ownership design.

cpp

void updateObject(MyObject &object) { object.applyChange(); }

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