There are two files (one header file and its implementation file) in a C++ static-library project:
ClassA.h
ClassA.cpp

ClassA.h has the following:

template<typename... Args>
class ClassA
{
public:
  explicit ClassA(Args&&... args);
  ~ClassA();
private:
  std::tuple<Args...> values;
};

Inside the Qt Creator's text editor, bring the mouse-cursor over the name of the constructor and press the right-click to open the context menu. Select "Refactor" -> "Add Definition in ClassA.cpp".

It auto-generates incorrect constructor definition:

template<typename Args>
ClassA<Args>::ClassA(Args &&args)
{
}

The correct constructor definition is:

template<typename... Args>
ClassA<Args...>::ClassA(Args&&... args)
{
}

Same is with auto-generation of any member functions of ClassA (if you add some). It omits the three dots.