c++list sortメソッド

   1:  #include <list>

   2:  #include <string>

   3:  #include <functional>

   4:  #include <iostream>

   5:   

   6:  struct S {

   7:           std::string firstname;

   8:           std::string secondname;

   9:           int ID;

  10:           //       ，     sort         <，          <        

  11:          bool operator < (S & b) { 

  12:              return ID < b.ID;

  13:           }

  14:   

  15:  };

  16:  int main(int argc, char* argv[])

  17:  { 

  18:             std::list<S> mylist; 

  19:             std::list<S>::iterator iter; 

  20:             S a; 

  21:             a.firstname ="dfadf"; 

  22:             a.ID = 5; 

  23:             mylist.push_back (a);    

  24:            a.firstname ="  "; 

  25:             a.ID = 9; 

  26:             mylist.push_back (a);   

  27:             a.firstname ="xxx"; 

  28:             a.ID = 7;  

  29:            mylist.push_back (a);  

  30:            a.firstname ="gggg"; 

  31:            a.ID = 25; 

  32:             mylist.push_back (a); 

  33:              mylist.sort();

  34:            //      operator        ，    ，    sort    

  35:             for (iter = mylist.begin(); iter != mylist.end();++iter)  

  36:             {     

  37:                       std::cout <<static_cast<S>(*iter).ID << "\t"; 

  38:              } 

  39:             std::cout <<std::endl;      

  40:             return 0;

  41:   }

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