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https://github.com/HowardHinnant/date.git
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Respect and minimize tie/flush in from/to_stream
* Save/restore tie, setting it to nullptr during the operation * On construction tie_->flush() * For ostreams only, flush if unitbuf
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Howard Hinnant
parent
d53db7a1cb
commit
973bd393bc
@ -942,33 +942,61 @@ struct is_clock<T, std::void_t<decltype(T::now()), typename T::rep, typename T::
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namespace detail {
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template<class CharT, class Traits = std::char_traits<CharT>>
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class save_stream
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class save_istream
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{
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std::basic_ios<CharT, Traits>& os_;
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protected:
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std::basic_ios<CharT, Traits>& is_;
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CharT fill_;
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std::ios::fmtflags flags_;
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std::streamsize width_;
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std::basic_ostream<CharT, Traits>* tie_;
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std::locale loc_;
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public:
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~save_stream()
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~save_istream()
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{
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os_.fill(fill_);
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os_.flags(flags_);
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os_.width(width_);
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os_.imbue(loc_);
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is_.fill(fill_);
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is_.flags(flags_);
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is_.width(width_);
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is_.imbue(loc_);
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is_.tie(tie_);
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}
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save_stream(const save_stream&) = delete;
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save_stream& operator=(const save_stream&) = delete;
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save_istream(const save_istream&) = delete;
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save_istream& operator=(const save_istream&) = delete;
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explicit save_stream(std::basic_ios<CharT, Traits>& os)
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: os_(os)
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, fill_(os.fill())
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, flags_(os.flags())
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, width_(os.width(0))
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, loc_(os.getloc())
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{}
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explicit save_istream(std::basic_ios<CharT, Traits>& is)
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: is_(is)
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, fill_(is.fill())
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, flags_(is.flags())
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, width_(is.width(0))
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, tie_(is.tie(nullptr))
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, loc_(is.getloc())
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{
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if (tie_ != nullptr)
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tie_->flush();
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}
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};
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template<class CharT, class Traits = std::char_traits<CharT>>
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class save_ostream
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: private save_istream<CharT, Traits>
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{
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public:
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~save_ostream()
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{
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if ((this->flags_ & std::ios::unitbuf) && !std::uncaught_exception() &&
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this->is_.good())
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this->is_.rdbuf()->pubsync();
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}
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save_ostream(const save_ostream&) = delete;
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save_ostream& operator=(const save_ostream&) = delete;
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explicit save_ostream(std::basic_ios<CharT, Traits>& os)
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: save_istream<CharT, Traits>(os)
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{
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}
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};
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template <class T>
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@ -1357,7 +1385,7 @@ inline
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std::basic_ostream<CharT, Traits>&
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operator<<(std::basic_ostream<CharT, Traits>& os, const day& d)
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{
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detail::save_stream<CharT, Traits> _(os);
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detail::save_ostream<CharT, Traits> _(os);
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os.fill('0');
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os.flags(std::ios::dec | std::ios::right);
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os.width(2);
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@ -1625,7 +1653,7 @@ inline
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std::basic_ostream<CharT, Traits>&
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operator<<(std::basic_ostream<CharT, Traits>& os, const year& y)
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{
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detail::save_stream<CharT, Traits> _(os);
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detail::save_ostream<CharT, Traits> _(os);
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os.fill('0');
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os.flags(std::ios::dec | std::ios::internal);
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os.width(4 + (y < year{0}));
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@ -2731,7 +2759,7 @@ inline
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std::basic_ostream<CharT, Traits>&
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operator<<(std::basic_ostream<CharT, Traits>& os, const year_month_day& ymd)
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{
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detail::save_stream<CharT, Traits> _(os);
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detail::save_ostream<CharT, Traits> _(os);
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os.fill('0');
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os.flags(std::ios::dec | std::ios::right);
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os << ymd.year() << '-';
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@ -3644,7 +3672,7 @@ public:
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std::basic_ostream<CharT, Traits>&
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operator<<(std::basic_ostream<CharT, Traits>& os, const decimal_format_seconds& x)
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{
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date::detail::save_stream<CharT, Traits> _(os);
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date::detail::save_ostream<CharT, Traits> _(os);
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os.fill('0');
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os.flags(std::ios::dec | std::ios::right);
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os.width(2);
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@ -3689,7 +3717,7 @@ public:
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std::basic_ostream<CharT, Traits>&
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operator<<(std::basic_ostream<CharT, Traits>& os, const decimal_format_seconds& x)
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{
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date::detail::save_stream<CharT, Traits> _(os);
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date::detail::save_ostream<CharT, Traits> _(os);
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os.fill('0');
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os.flags(std::ios::dec | std::ios::right);
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os.width(2);
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@ -3889,7 +3917,7 @@ public:
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operator<<(std::basic_ostream<CharT, Traits>& os, const time_of_day_storage& t)
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{
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using namespace std;
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detail::save_stream<CharT, Traits> _(os);
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detail::save_ostream<CharT, Traits> _(os);
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if (t.neg_)
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os << '-';
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os.fill('0');
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@ -3972,7 +4000,7 @@ public:
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operator<<(std::basic_ostream<CharT, Traits>& os, const time_of_day_storage& t)
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{
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using namespace std;
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detail::save_stream<CharT, Traits> _(os);
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detail::save_ostream<CharT, Traits> _(os);
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if (t.neg_)
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os << '-';
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os.fill('0');
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@ -4062,7 +4090,7 @@ public:
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operator<<(std::basic_ostream<CharT, Traits>& os, const time_of_day_storage& t)
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{
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using namespace std;
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detail::save_stream<CharT, Traits> _(os);
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detail::save_ostream<CharT, Traits> _(os);
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if (t.neg_)
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os << '-';
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os.fill('0');
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@ -4172,7 +4200,7 @@ public:
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operator<<(std::basic_ostream<CharT, Traits>& os, const time_of_day_storage& t)
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{
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using namespace std;
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detail::save_stream<CharT, Traits> _(os);
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detail::save_ostream<CharT, Traits> _(os);
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if (t.neg_)
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os << '-';
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os.fill('0');
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@ -4586,7 +4614,7 @@ to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
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using namespace std;
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using namespace std::chrono;
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using namespace detail;
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date::detail::save_stream<CharT, Traits> ss(os);
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date::detail::save_ostream<CharT, Traits> ss(os);
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os.fill(' ');
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os.flags(std::ios::skipws | std::ios::dec);
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os.width(0);
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@ -4704,7 +4732,7 @@ to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
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else // *fmt == 'x'
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{
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auto const& ymd = fds.ymd;
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save_stream<CharT, Traits> _(os);
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save_ostream<CharT, Traits> _(os);
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os.fill('0');
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os.flags(std::ios::dec | std::ios::right);
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os.width(2);
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@ -4736,7 +4764,7 @@ to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
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if (modified == CharT{})
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#endif
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{
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save_stream<CharT, Traits> _(os);
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save_ostream<CharT, Traits> _(os);
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os.fill('0');
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os.flags(std::ios::dec | std::ios::right);
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if (y >= 0)
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@ -4781,7 +4809,7 @@ to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
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if (modified == CharT{})
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#endif
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{
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save_stream<CharT, Traits> _(os);
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save_ostream<CharT, Traits> _(os);
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if (*fmt == CharT{'d'})
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os.fill('0');
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else
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@ -4813,7 +4841,7 @@ to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
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if (!fds.ymd.ok())
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os.setstate(std::ios::failbit);
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auto const& ymd = fds.ymd;
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save_stream<CharT, Traits> _(os);
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save_ostream<CharT, Traits> _(os);
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os.fill('0');
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os.flags(std::ios::dec | std::ios::right);
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os.width(2);
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@ -4841,7 +4869,7 @@ to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
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if (!fds.ymd.ok())
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os.setstate(std::ios::failbit);
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auto const& ymd = fds.ymd;
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save_stream<CharT, Traits> _(os);
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save_ostream<CharT, Traits> _(os);
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os.fill('0');
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os.flags(std::ios::dec | std::ios::right);
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os.width(4);
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@ -4878,7 +4906,7 @@ to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
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os << y;
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else
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{
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save_stream<CharT, Traits> _(os);
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save_ostream<CharT, Traits> _(os);
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os.fill('0');
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os.flags(std::ios::dec | std::ios::right);
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os.width(2);
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@ -4941,7 +4969,7 @@ to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
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auto ld = local_days(fds.ymd);
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auto y = fds.ymd.year();
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auto doy = ld - local_days(y/jan/1) + days{1};
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save_stream<CharT, Traits> _(os);
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save_ostream<CharT, Traits> _(os);
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os.fill('0');
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os.flags(std::ios::dec | std::ios::right);
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os.width(3);
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@ -5081,7 +5109,7 @@ to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
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#else
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time_of_day<seconds> tod(duration_cast<seconds>(fds.tod.to_duration()));
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tod.make12();
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save_stream<CharT, Traits> _(os);
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save_ostream<CharT, Traits> _(os);
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os.fill('0');
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os.width(2);
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os << tod.hours().count() << CharT{':'};
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@ -6019,7 +6047,7 @@ from_stream(std::basic_istream<CharT, Traits>& is, const CharT* fmt,
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typename basic_istream<CharT, Traits>::sentry ok{is, true};
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if (ok)
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{
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date::detail::save_stream<CharT, Traits> ss(is);
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date::detail::save_istream<CharT, Traits> ss(is);
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is.fill(' ');
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is.flags(std::ios::skipws | std::ios::dec);
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is.width(0);
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@ -713,7 +713,7 @@ inline
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std::basic_ostream<CharT, Traits>&
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operator<<(std::basic_ostream<CharT, Traits>& os, const year& y)
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{
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date::detail::save_stream<CharT, Traits> _(os);
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date::detail::save_ostream<CharT, Traits> _(os);
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os.fill('0');
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os.flags(std::ios::dec | std::ios::internal);
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os.width(4 + (y < year{0}));
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@ -875,7 +875,7 @@ inline
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std::basic_ostream<CharT, Traits>&
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operator<<(std::basic_ostream<CharT, Traits>& os, const weeknum& wn)
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{
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date::detail::save_stream<CharT, Traits> _(os);
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date::detail::save_ostream<CharT, Traits> _(os);
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os << 'W';
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os.fill('0');
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os.flags(std::ios::dec | std::ios::right);
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@ -1224,7 +1224,7 @@ detail::operator<<(std::ostream& os, const Rule& r)
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{
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using namespace date;
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using namespace std::chrono;
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detail::save_stream<char> _(os);
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detail::save_ostream<char> _(os);
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os.fill(' ');
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os.flags(std::ios::dec | std::ios::left);
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os.width(15);
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@ -2541,7 +2541,7 @@ operator<<(std::ostream& os, const time_zone& z)
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{
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using namespace date;
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using namespace std::chrono;
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detail::save_stream<char> _(os);
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detail::save_ostream<char> _(os);
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os.fill(' ');
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os.flags(std::ios::dec | std::ios::left);
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std::call_once(*z.adjusted_,
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@ -2715,7 +2715,7 @@ std::ostream&
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operator<<(std::ostream& os, const link& x)
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{
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using namespace date;
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detail::save_stream<char> _(os);
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detail::save_ostream<char> _(os);
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os.fill(' ');
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os.flags(std::ios::dec | std::ios::left);
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os.width(35);
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