stream.h

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#pragma once
#include "detail/unit.h"
#include "detail/unit_symbol.h"
 
#include <istream>
#include <ostream>
 
template <char _symbol, typename _exponent, typename _type, typename _ratio>
std::ostream &
operator<<(std::ostream &stream,
           const SI::detail::unit_t<_symbol, _exponent, _type, _ratio> &unit) {
  stream << unit.value() << " "
         << SI::unit_symbol<_symbol, _ratio, _exponent>::str;
  return stream;
}
 
// @todo add implicit optiona conversion when reading strings of the correct
// unit but the wrong ratio
template <char _symbol, typename _exponent, typename _type, typename _ratio>
std::istream &
operator>>(std::istream &stream,
           SI::detail::unit_t<_symbol, _exponent, _type, _ratio> &obj) {
  _type v;
  std::string unit_symbol;
  stream >> v >> unit_symbol;
 
  if (unit_symbol.compare(SI::unit_symbol<_symbol, _ratio, _exponent>::str) !=
      0) {
    stream.setstate(std::ios::failbit);
  }
  obj.setValue(v);
  return stream;
}
 
namespace SI {
template <char _symbol, typename _exponent, typename _type, typename _ratio>
std::string
to_string(const SI::detail::unit_t<_symbol, _exponent, _type, _ratio> &value) {
  return std::to_string(value.value())
      .append(" ")
      .append(SI::unit_symbol<_symbol, _ratio, _exponent>::str);
}
} // namespace SI