CppEditor: Let users create implementations for all member functions

... in one go.

Fixes: QTCREATORBUG-12164
Change-Id: Ifc81c8b1caf4319ce57882375f513d72e4c0ea52
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/cppeditor/cppquickfixes.h

@@ -407,6 +407,26 @@ private:
             const CPlusPlus::FunctionDefinitionAST *ctor) const;
 };
 
+/*!
+  Adds a definition for any number of member function declarations.
+ */
+class InsertDefsFromDecls : public CppQuickFixFactory
+{
+public:
+    void match(const CppQuickFixInterface &interface,
+               TextEditor::QuickFixOperations &result) override;
+
+    enum class Mode {
+            Off,         // Testing: simulates user canceling the dialog
+            Alternating, // Testing: simulates user choosing a different DefPos for every function
+            User         // Normal interactive mode
+    };
+    void setMode(Mode mode) { m_mode = mode; }
+
+private:
+    Mode m_mode = Mode::User;
+};
+
 /*!
   Extracts the selected code and puts it to a function
  */