At Monday 2005-02-07 00:53, you wrote:
Hi all,
I'm having this particular class
class File { public: int get_size(); std::string get_name();
private: int size, std::string name; } ;
kinda difficult to make name anything other than ""
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.
sort(files.begin(), files.end(), binary_predicate) exists
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
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