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Add to_stream which avoids temporary streams and strings.

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*  This is a low-level formatting facility which other functions
   such as format call into.
This commit is contained in:
Howard Hinnant 2016-11-25 20:36:22 -05:00
parent 0cfa783b14
commit 298e9aff2d
2 changed files with 862 additions and 160 deletions
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975
date.h
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47
tz.h
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@ -1298,46 +1298,55 @@ to_gps_time(const tai_time<Duration>& t) NOEXCEPT
// format
template <class CharT, class Traits, class Duration>
inline
std::basic_string<CharT, Traits>
format(const std::locale& loc, std::basic_string<CharT, Traits> fmt,
const zoned_time<Duration>& tp)
void
to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
const zoned_time<Duration>& tp)
{
auto const info = tp.get_info();
return detail::format(loc, std::move(fmt), tp.get_local_time(),
&info.abbrev, &info.offset);
to_stream(os, fmt, tp.get_local_time(), &info.abbrev, &info.offset);
}
// basic_string formats
template <class CharT, class Traits, class Duration>
std::basic_string<CharT, Traits>
format(const std::locale& loc, const std::basic_string<CharT, Traits>& fmt,
const zoned_time<Duration>& tp)
{
std::basic_ostringstream<CharT, Traits> os;
os.imbue(loc);
to_stream(os, fmt.c_str(), tp);
return os.str();
}
template <class CharT, class Traits, class Duration>
inline
std::basic_string<CharT, Traits>
format(std::basic_string<CharT, Traits> fmt, const zoned_time<Duration>& tp)
format(const std::basic_string<CharT, Traits>& fmt, const zoned_time<Duration>& tp)
{
auto const info = tp.get_info();
return detail::format(std::locale{}, std::move(fmt), tp.get_local_time(),
&info.abbrev, &info.offset);
std::basic_ostringstream<CharT, Traits> os;
to_stream(os, fmt.c_str(), tp);
return os.str();
}
// const CharT* formats
template <class CharT, class Duration>
inline
std::basic_string<CharT>
format(const std::locale& loc, const CharT* fmt, const zoned_time<Duration>& tp)
{
auto const info = tp.get_info();
return detail::format(loc, std::basic_string<CharT>(fmt), tp.get_local_time(),
&info.abbrev, &info.offset);
std::basic_ostringstream<CharT> os;
os.imbue(loc);
to_stream(os, fmt, tp);
return os.str();
}
template <class CharT, class Duration>
inline
std::basic_string<CharT>
format(const CharT* fmt, const zoned_time<Duration>& tp)
{
auto const info = tp.get_info();
return detail::format(std::locale{}, std::basic_string<CharT>(fmt),
tp.get_local_time(), &info.abbrev, &info.offset);
std::basic_ostringstream<CharT> os;
to_stream(os, fmt, tp);
return os.str();
}
} // namespace date