Hi all, I'm having this particular class class File { public: int get_size(); std::string get_name(); private: int size, std::string name; } ; and a vector of objects of this class. vector <File> files ; and if want to sort the elements of the container i use stable_sort (files.begin(), files.end()) // Invokes operator < if its defined. otherwise shows up an error. there's another form of stable_sort, in which we can call a sorting function of our own. Now my problem is the sorting criteria i use is dependent on runtime. say at times i want to sort by size and at other times i want to sort them by name of the file. The simple solution could be write 2 functions, sort_on_size and sort_on_filename which does the work. Now, the sorting order is also decided at runtime. So i write 2 more functions for that. The problem is the number of functions i use increase like any thing, which does not look good. The best way should be to use bind (or am i wrong here ?) from Boost library. But i'm not getting the syntax correctly here. the crude way could be stable_sort (files.begin(), files.end(), (bind (&File::get_size, _1) > bind (&File::get_size, _2))) ; that is call get_size() on first argument, and call get_size() on second argument, and compare those values, and return a boolean value. Can anybody please help me out with the syntax here. ?? Thanks in advance, Surya