Fix for #341 (Functions passed as pointer not detected as used)

src/checkfunctionusage.cpp

@@ -107,6 +107,9 @@ void CheckFunctionUsage::parseTokens(const Tokenizer &tokenizer)
         if (Token::Match(tok, "[;{}.,()[=+-/&|!?:] %var% [(),;:}]"))
             funcname = tok->next();
 
+        if (Token::Match(tok, "[(,] & %var% :: %var% [,)]"))
+            funcname = tok->tokAt(4);
+
         // funcname ( => Assert that the end paranthesis isn't followed by {
         if (Token::Match(funcname, "%var% ("))
         {

test/testfunctionusage.cpp

@@ -39,6 +39,7 @@ private:
         TEST_CASE(return1);
         TEST_CASE(callback1);
         TEST_CASE(else1);
+        TEST_CASE(functionpointer);
     }
 
     void check(const char code[])
@@ -98,6 +99,20 @@ private:
         std::string err(errout.str());
         ASSERT_EQUALS(std::string(""), errout.str());
     }
+
+    void functionpointer()
+    {
+        check("namespace abc {\n"
+              "void foo() { }\n"
+              "};\n"
+              "\n"
+              "int main()\n"
+              "{\n"
+              "    f(&abc::foo);\n"
+              "    return 0\n"
+              "}\n");
+        ASSERT_EQUALS(std::string(""), errout.str());
+    }
 };
 
 REGISTER_TEST(TestFunctionUsage)