language: C++ 4.7.2 (gcc-4.7.2)
date: 631 days 12 hours ago
link:
visibility: public 
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#include <iostream>
#include <locale>
#include <sstream>
 
template<class Char>
class MyFacet : public std::numpunct<Char> {
public:
  std::string do_grouping() const { return "\3"; }
  Char do_thousands_sep() const { return ' '; }
};
 
std::string number_fmt(unsigned long n)
{
  std::ostringstream oss;
  oss.imbue(std::locale(oss.getloc(), new MyFacet<char>));
  oss << n;
  return oss.str();
}
 
int main() {
  std::cout << number_fmt(123456789) << "\n";
}