c++ - Finding a classmember in a vector of other class members -

i have classes team , player. every team member has object vector playerlist players stored in. every player has attributes id. want transfer player team . created function this.

first want findout if player b maybe member of team a, in case message should printed out. failed in writing function this.

here try(the search starts in if loop, want find out if player b member of team a)

#include <vector> #include <string> #include <iostream>  using namespace std;  class player { public:  private:   };  class team { public:       vector<player> getplayerlist(){         return playerlist;     }     string getteamname(){         return teamname;     }     void playerbuy(team a, player b)     {         vector<player> playerlist;         playerlist = a.getplayerlist();         if (find(playerlist.begin(), playerlist.end(), 5) != playerlist.end()) {          }         else {             cout << "this player not member of " << a.getteamname();         }     }  private:     vector<player> playerlist;     string teamname; };  int main() {     return 0;  } 

i got error c2678: binary '==' : no operator found takes left-hand operand of type 'player' (or there no acceptable conversion). figured out comes line

if (find(playerlist.begin(), playerlist.end(), 5) != playerlist.end()) 

the =! playerlist.end() seems wrong there. part of code copy of code don't know does. should put in there instead ? , 5 means ?

the error giving hint: need implement equality operator class player. std::find uses determine if element has been found.

alternatively, can use std::find_if custom unary predicate.