#include <iostream>
#include <string>
 
void print_str(std::string const * _str, int _flag = 0){
 static int count_call = 0;
 ++count_call;
 int count_print = _flag ? count_call : 1;
 
 while(count_print--)
  std::cout << *_str << std::endl;
}
 
int main(){
 std::string str{"Hello, world!"};
 
 print_str(&str);
 print_str(&str);
 print_str(&str);
 std::cout << std::endl;
 
 print_str(&str, 1);
 std::cout << std::endl;
 
 print_str(&str);
 
 return (0);
}
 

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