Inheriting List to Sortable List-protected members out of scope

I am developing a list in which I have used some protected variables count, entry[maxlist] etc.

List.h

class List
    {
    public:
    //etc etc

    protected:
    int count;
    int entry[maxlist];
    };

Sortable_list.h

typedef Key Record;
class Sortable_list:public List<Record>
{
void selection_sort()
    {
        for(int position=count-1;position>0;i--) // Count is not declared in the scope
        {
        int max=max_key(0, position);
        swap(max,开发者_JS百科 position);
        }
    }
};

Is something wrong with inheriting the List to Sortable List? Why is it showing count out of scope?

#Edit: After seeing your whole code it becomes clearer. You're having ambiguities because of your includes, it will compile with msvc, because it handles such cases silently, but for g++ you should explicitly state that count is from this class, by doing this->count. You also had problems because of std::range_error, which could be avoided by removing using namespace std or replacing range_error with ::range_error which will indicate that you want the global scope. Another problem with your code is that, you were using an undefined variable i in your Sortable_list. The fixed code that compiles with g++ and msvc: http://codepad.org/7V70rNqf

I don't want to sound rude, but I strongly suggest you read a book on C++, your current code is very anti-idiomatic, and could be made generic with a smaller amount of code.

Why don't you use sort function template from <algorithm> header? All you need to write just one small Compare function.

Look like your List is not a template class, so List< Typename > doesn't exist .. Also, you can use std::set<T> as a template class for sorted container => http://www.sgi.com/tech/stl/set.html