c++ - Run member function of an object in separate file -

i have separate files functions , variables use in program; header file , implementation file.

file.hpp:

#ifndef file_h #define file_h  #include <sfml/graphics.hpp>  extern sf::font sffont;  #endif // file_h 

file.cpp:

#include "file.hpp"  sf::font sffont;  sffont.loadfromfile("ubuntu.ttf");  // <- error 

my problem on line i've commented on. except line run member function "loadfromfile". instead, error: "error: ´sffont´ not name type". how solve this?

as can see use library sfml, don't think it's relevant.

lines such as

sffont.loadfromfile("ubuntu.ttf"); 

are valid inside other functions.

if want able make function call, can use helper function initialize dummy variable , make function call in helper function.

static int init() {    sffont.loadfromfile("ubuntu.ttf");    return 0; }  int dummy = init();