Override Rule in CppCheck

[Sourabh Joshi]

Consider the following Code snippet:
#include <iostream>
using namespace std;
class MyClass : public std::basic_streambuf<char>
{
public :
int_type overflow(int_type c = traits_type::eof());
};</char></iostream>

CppCheck Does not detects that the function 'overflow' is virtual in the std::basic_streambuf class and
does not hits the predefined rule which is
"The function '$symbol' overrides a function in a base class but is not marked with a 'override' specifier."

It Happens because the class that is inherited is in a lib function and the Code File does not exits in the folder path specified.
Can any one tell me what should I do to hit the Rule.

Any help would be appreciated..

Note : The Corresponding Function is in the checkclass.cpp - void CheckClass::checkOverride()

[Sourabh Joshi]

There is unwanted characters in the above code
Here is the updated code :

include <iostream></iostream>

using namespace std;
class MyClass : public std::basic_streambuf<char>
{
public :
int_type overflow(int_type c = traits_type::eof());
};</char>

[versat]

You can insert / write code inside blocks sourrounded by ~~~ (each on its own line) to avoid that the code is changed / characters are inserted.
Example:

~~~
// write your code here
~~~

Currently we do not have information in the Cppcheck library configuration whether a function is virtual. Not sure if that would really help or if it is some other bug.
A ticket requesting to make it possible that functions can be marked virtual in the library configuration already exists:
https://trac.cppcheck.net/ticket/8468