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#include <iostream>
#include <string>
 
using std::string;
using std::cout;
 
struct fstream{
	fstream(const string &){}
	fstream(const fstream &) = delete;
};
 
fstream open_file(const string &file_name){
	return fstream(file_name);
}
 
void load_map(){
	string file_name = "mapa.txt";
    fstream file = open_file(file_name);
}
 
 
int main() {
	load_map();
	return 0;
}

prog.cpp: In function 'fstream open_file(const string&)':
prog.cpp:13:26: error: use of deleted function 'fstream::fstream(const fstream&)'
  return fstream(file_name);
                          ^
prog.cpp:9:2: note: declared here
  fstream(const fstream &) = delete;
  ^
prog.cpp: In function 'void load_map()':
prog.cpp:18:39: error: use of deleted function 'fstream::fstream(const fstream&)'
     fstream file = open_file(file_name);
                                       ^
prog.cpp:9:2: note: declared here
  fstream(const fstream &) = delete;
  ^

Standard output is empty