Sorting a vector of structs

[Philia]

Hi there,

I have struct like this one:

struct kurs
{
        unsigned short int var1;
        string string_var;
        int sort_var;
};

// and a vector like this one

vector < struct kurs> kurs_2;

thing is that I want to sort a vector by sort_var.
How can I do that?

Regards,
Philia

[Laharl]

You can overload operator< to return based on that value, or write a function that takes two kurs inputs and returns one < other based on that variable. Then, you can call sort() from #algorithm and bingo, it's sorted. Note that using the second option requires using the three-parameter sort with the function name as the third argument.

[Philia]

Thank you for reply.

I made it this way:

class sorting
{
 
public:
 
    bool operator() ( const kurs & s, const kurs & t)
 
    {
 
        return s.wspolczynnik_sort < t.wspolczynnik_sort;
 
    }
 
};

...

std::sort(kursy_2.begin(),kursy_2.end(),sorting());

Hope it will be helpful to someone :)

Regards,
Philia