__binary_formatter.hpp

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#pragma once
#if !defined(__XTD_CORE_INTERNAL__)
#error "Do not include this file: Internal use only"
#endif
 
#include <bitset>
#include <cmath>

template<typename char_t, typename value_t>
[[nodiscard]] inline auto __binary_formatter(value_t value, int precision) -> std::basic_string<char_t> {
  std::basic_string<char_t> result = std::bitset<sizeof(value) * 8>(value).to_string(char_t('0'), char_t('1'));
  while (result[0] != 0 && result[0] == char_t('0'))
    result.erase(0, 1);
  if (precision < 0 && result.size() > size_t(std::abs(precision)))
    result.append(result.size() - std::abs(precision), char_t(' '));
  else {
    if (precision == 0) precision = 1;
    if (size_t(precision) > result.size())
      result.insert(0, size_t(precision) - result.size(), char_t('0'));
  }
  return result;
}