C++ game loading objects / global objects -

i still new c++ please forgive me if question unbearably obvious. (attempting) code rpg game. compiling nicely @ moment, have think how going load of objects (for unit classes, items etc) when game opens.

i have seen threads dll's , global objects using extern's in header files, wondered practical/efficient method? (as game large)

as stands, code clunky , not implemented ( did not think before trying use function declare objects in separate function , wonder why weren't accessible), should using extern rather having declare objects in main() in order instantiate them (see below).

#include <iostream> #include <string> #include "unit.h" #include "uclass.h"  using namespace std;  // seperate function @ program start load class list. void loadclass(uclass& obj) {     obj.load("peasant");  }  int main() {      //load classes...     cout << "creating peasant...\n";     uclass peasant;     loadclass(peasant);     cout << peasant.show() << endl;      cout << "\ncreating unit...\n";     unit man;     man.setlvl();     man.setclass(peasant);     man.showinfo();      return 0; } 

sorry again, first attempt @ multiple file project , thank in advance!

take std library have defined such structures example list. idea create list of objects load game, , while in resolving geometry or other logic want iterate through list. think start. if got concerns correctly.