signal slot信号重载情况

connect(dynamiccast<A*>(a), static_cast<void (A::*)(QString)>(&A::b),[]{}() );

connect(dynamiccast<A*>(a), QOverload<QString>::of(&A::b),[]{}() );

qt 5.5 跨库用信号使用qt5的连接方式会出现multiple definition错误

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