Fixed #2407 (False positive: unused private function)

lib/checkclass.cpp

@@ -199,6 +199,11 @@ void CheckClass::privateFunctions()
     if (Token::findmatch(_tokenizer->tokens(), "; __property ;"))
         return;
 
+    // #2407 calls from operator() is not detected
+    // TODO: Don't bailout. Detect the call.
+    if (Token::findmatch(_tokenizer->tokens(), "operator ( )"))
+        return;
+
     createSymbolDatabase();
 
     std::list<SymbolDatabase::SpaceInfo *>::iterator i;

test/testunusedprivfunc.cpp

@@ -57,6 +57,9 @@ private:
 
         // No false positives when there are "unused" templates that are removed in the simplified token list
         TEST_CASE(template1);
+
+        // #2407 - FP when called from operator()
+        TEST_CASE(fp_operator);
     }
 
 
@@ -414,6 +417,36 @@ private:
               "};\n");
         ASSERT_EQUALS("", errout.str());
     }
+
+    void fp_operator()
+    {
+        // #2407 - FP when function is called from operator()
+        check("class Fred\n"
+              "{\n"
+              "public:\n"
+              "    void operator()(int x) {\n"
+              "        startListening();\n"
+              "    }\n"
+              "\n"
+              "private:\n"
+              "    void startListening() {\n"
+              "    }\n"
+              "};\n");
+        ASSERT_EQUALS("", errout.str());
+
+        check("class Fred\n"
+              "{\n"
+              "public:\n"
+              "    void operator()(int x) {\n"
+              "    }\n"
+              "\n"
+              "private:\n"
+              "    void startListening() {\n"
+              "    }\n"
+              "};\n");
+        TODO_ASSERT_EQUALS("[test.cpp:8]: (style) Unused private function 'Fred::startListening'\n", errout.str());
+        ASSERT_EQUALS("", errout.str());
+    }
 };
 
 REGISTER_TEST(TestUnusedPrivateFunction)