Упорядочивание массивов - C++ - Ответ 364505

#include <iostream>
#include <vector>
#include <complex>
#include <algorithm>
#include <functional>
 
 
struct complex : public std::binary_function<std::complex<double>,std::complex<double>,bool> 
{
    bool operator() (const std::complex<double> &a, const std::complex<double> &b)
    {
        return a.real() > b.real();
    }
};
 
int main()
{
    std::vector<std::complex<double>>a;
    std::complex<double>first(2.0,2.0);
    std::complex<double>second(3.0,3.0);
    std::complex<double>third(4.0,4.0);
    a.push_back(first);
    a.push_back(second);
    a.push_back(third);
    std::copy(a.begin(),a.end(),std::ostream_iterator<std::complex<double>>(std::cout," "));
    std::sort(a.begin(),a.end(),complex());
    std::cout<<"new array"<<std::endl;
    std::copy(a.begin(),a.end(),std::ostream_iterator<std::complex<double>>(std::cout," "));
    return 0;
}