std::sort的详细用法

 #include <algorithm>
 #include <functional>
 #include <array>
 #include <iostream>

 int main()
 {
     std::array<int, > s = { , , , , , , , , ,  };

     // sort using the default operator<
     std::sort(s.begin(), s.end());
     for (auto a : s) {
         std::cout << a << " ";
     }
     std::cout << '\n';

     // sort using a standard library compare function object
     std::sort(s.begin(), s.end(), std::greater<int>());
     for (auto a : s) {
         std::cout << a << " ";
     }
     std::cout << '\n';

     // sort using a custom function object
     struct {
         bool operator()(int a, int b) const
         {
             return a < b;
         }
     } customLess;
     std::sort(s.begin(), s.end(), customLess);
     for (auto a : s) {
         std::cout << a << " ";
     }
     std::cout << '\n';

     // sort using a lambda expression
     std::sort(s.begin(), s.end(), [](int a, int b) {
         return b < a;
     });
     for (auto a : s) {
         std::cout << a << " ";
     }
     std::cout << '\n';
 }