sorting linked list of objects

I have a problem I hope somebody kan help me with. I have a number of objects of type

class code
    {
    public:
          string file;
          vector<string> files;
          int start, size;

          code(){}
          ~code(){}
          bool operator< (const code *a)  { return this->files.size() >= a->files.size(); };
    };

that I want to put in a STL-list

list<code *> tmp_list;

[FONT=&quot]

and then I want to sort them so that the code object with the biggest vector<string> files comes first

[/FONT]

tmp_list.sort();

[FONT=&quot]

But this doesn't work!? Instead I get a list sorted after int start... Can somebody see what I am doing wrong here? Or is the problem somewhere else in my program?
[/FONT]

thanks for answering. I was guessing it had something to do with this...
but what if I want to use a list of pointers, is there no way to sort the list then?