fix #2807 (Wrong handling of function references when prefixed with &)

lib/checkclass.cpp

@@ -662,7 +662,7 @@ void CheckClass::privateFunctions()
         while (!FuncList.empty())
         {
             // Final check; check if the function pointer is used somewhere..
-            const std::string _pattern("return|(|)|,|= " + FuncList.front()->str());
+            const std::string _pattern("return|(|)|,|= &|" + FuncList.front()->str());
 
             // or if the function address is used somewhere...
             // eg. sigc::mem_fun(this, &className::classFunction)

test/testunusedprivfunc.cpp

@@ -45,6 +45,7 @@ private:
         TEST_CASE(func_pointer1);
         TEST_CASE(func_pointer2);
         TEST_CASE(func_pointer3);
+        TEST_CASE(func_pointer4); // ticket #2807
 
         TEST_CASE(ctor);
 
@@ -298,6 +299,21 @@ private:
     }
 
 
+    void func_pointer4() // ticket #2807
+    {
+        check("class myclass {\n"
+              "public:\n"
+              "    myclass();\n"
+              "private:\n"
+              "    static void f();\n"
+              "    void (*fptr)();\n"
+              "};\n"
+              "myclass::myclass() { fptr = &f; }\n"
+              "void myclass::f() {}\n");
+        ASSERT_EQUALS("", errout.str());
+    }
+
+
     void ctor()
     {
         check("class PrivateCtor\n"