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#include <cstdlib>
#include <iostream>
#include <string>
#include <map>
 
using namespace std;
 
/*
 * 
 */
class apple{
private:
    int a,b,c,d;
public:
    int foo(){
        return a+b+c+d;
    }
};
class ball{
private:
    map<apple,string> mp;
public:
    void foo2(){
        for(map<apple,string>::iterator it = mp.begin();it!=mp.end();++it){
            cout<<it->first.foo()<<endl;
        }
    }
 
}
int main(int argc, char** argv) {
 
    return 0;
}

prog.cpp:29:1: error: expected ‘;’ after class definition
 }
 ^
prog.cpp: In member function ‘void ball::foo2()’:
prog.cpp:25:33: error: passing ‘const apple’ as ‘this’ argument discards qualifiers [-fpermissive]
             cout<<it->first.foo()<<endl;
                                 ^
prog.cpp:15:9: note:   in call to ‘int apple::foo()’
     int foo(){
         ^~~

Standard output is empty