\'Undefined Reference to vtable\' in Qt Projects: How to Fix It?

Compilation Troubles: Resolving "Undefined Reference to vtable" in Qt Projects

Encountering an "undefined reference to vtable" error during the compilation of a Qt project can be disheartening. This issue arises when the compiler cannot locate the virtual method table (vtable), which contains pointers to the virtual functions of a class.

In your specific case, the error pertains to the AddressBook class. To address this, you should employ the following steps using Qt Creator:

1. Build → Run qmake: This command refreshes the makefiles, ensuring that Qt's build system acknowledges any project modifications.
2. Build → Rebuild All: This comprehensive rebuild ensures all project components, including the AddressBook vtable, are recompiled and linked seamlessly.

By executing these steps, you can resolve the "undefined reference to vtable" error and proceed with your Qt project compilation effortlessly.

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