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  1. #include <iostream>
  2. #include <limits>
  3.  
  4. template <typename CharT, typename OutIt>
  5. class bin_num_put : public std::num_put<CharT, OutIt> {
  6.   OutIt do_put(OutIt to, std::ios_base& fmt, CharT, unsigned long long v) const
  7.   {
  8.     using std::begin; using std::end;    
  9.     char narrow[] = "01";
  10.     CharT wide[2];
  11.     std::use_facet<std::ctype<CharT> >(fmt.getloc())
  12.       .widen(begin(narrow), end(narrow) - 1, begin(wide));
  13.     CharT buffer[std::numeric_limits<unsigned long long>::digits];
  14.     std::fill(begin(buffer), end(buffer), wide[0]);
  15.     for (CharT* e = end(buffer); v != 0; v /= 2)
  16.       *--e = wide[v % 2];
  17.     return std::copy(begin(buffer), end(buffer), to);
  18.   }
  19.   OutIt do_put(OutIt to, std::ios_base& fmt, CharT fill, long long v) const
  20.   { return do_put(to, fmt, fill, static_cast<unsigned long long>(v)); }
  21. };
  22. template <typename CharT, typename traits>
  23. std::basic_ios<CharT, traits>& bin(std::basic_ios<CharT, traits>& ios)
  24. {
  25.   ios.imbue(std::locale(ios.getloc(),
  26.                         new bin_num_put<CharT, std::ostreambuf_iterator<CharT> >()));
  27.   return ios;
  28. }
  29.  
  30. int main()
  31. {
  32.   std::cout << bin << 18446744073709551615ull << std::endl;
  33. }
Success #stdin #stdout 0s 3032KB
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stdin
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Standard input is empty
stdout
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1111111111111111111111111111111111111111111111111111111111111111
https://ideone.com/E5Fvnf
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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