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Port ptz.h to C++20

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Howard Hinnant
2025-06-05 11:08:57 -04:00
parent 6d7739e7e8
commit 0a1b72bf9d
1 changed files with 140 additions and 101 deletions
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241
include/date/ptz.h
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@@ -61,12 +61,30 @@
// They are provided here as a non-trivial custom time zone example, and if you really
// have to have Posix time zones, you're welcome to use this one.
#include "date/tz.h"
#include <algorithm>
#include <cassert>
#include <cctype>
#include <chrono>
#include <ostream>
#include <string>
#ifndef HAS_CHRONO_20
# if defined(_LIBCPP_VERSION) && _LIBCPP_VERSION <= 200100
# define HAS_CHRONO_20 0
# else
# define HAS_CHRONO_20 1
# endif
#endif
#if HAS_CHRONO_20
namespace chr = std::chrono;
# define HAS_STRING_VIEW 1
# include <format>
#else
# include "date/tz.h"
namespace chr = date;
#endif
namespace Posix
{
@@ -97,8 +115,8 @@ class rule
{
enum {off, J, M, N};
date::month m_;
date::weekday wd_;
chr::month m_;
chr::weekday wd_;
unsigned short n_ : 14;
unsigned short mode_ : 2;
std::chrono::duration<std::int32_t> time_ = std::chrono::hours{2};
@@ -107,7 +125,7 @@ public:
rule() : mode_(off) {}
bool ok() const {return mode_ != off;}
date::local_seconds operator()(date::year y) const;
chr::local_seconds operator()(chr::year y) const;
std::string to_string() const;
friend std::ostream& operator<<(std::ostream& os, const rule& r);
@@ -141,15 +159,15 @@ operator!=(const rule& x, const rule& y)
}
inline
date::local_seconds
rule::operator()(date::year y) const
chr::local_seconds
rule::operator()(chr::year y) const
{
using date::local_days;
using date::January;
using date::days;
using date::last;
using chr::local_days;
using chr::January;
using chr::days;
using chr::last;
using sec = std::chrono::seconds;
date::local_seconds t;
chr::local_seconds t;
switch (mode_)
{
case J:
@@ -177,7 +195,7 @@ rule::to_string() const
std::string nm;
if (off != hours{2})
{
date::hh_mm_ss<seconds> offset{off};
chr::hh_mm_ss<seconds> offset{off};
nm = '/';
nm += std::to_string(offset.hours().count());
if (offset.minutes() != minutes{0} || offset.seconds() != seconds{0})
@@ -230,17 +248,29 @@ operator<<(std::ostream& os, const rule& r)
switch (r.mode_)
{
case rule::J:
#if HAS_CHRONO_20
os << "J " << r.n_ << std::format("{:%T}", r.time_);
#else
os << 'J' << r.n_ << date::format(" %T", r.time_);
#endif
break;
case rule::M:
if (r.n_ == 5)
os << r.m_/r.wd_[date::last];
os << r.m_/r.wd_[chr::last];
else
os << r.m_/r.wd_[r.n_];
os << date::format(" %T", r.time_);
#if HAS_CHRONO_20
os << ' ' << std::format("{:%T}", r.time_);
#else
os << date::format(" %T", r.time_);
#endif
break;
case rule::N:
#if HAS_CHRONO_20
os << r.n_ << ' ' << std::format("{:%T}", r.time_);
#else
os << r.n_ << date::format(" %T", r.time_);
#endif
break;
default:
break;
@@ -263,21 +293,21 @@ public:
explicit time_zone(const detail::string_t& name);
template <class Duration>
date::sys_info get_info(date::sys_time<Duration> st) const;
chr::sys_info get_info(chr::sys_time<Duration> st) const;
template <class Duration>
date::local_info get_info(date::local_time<Duration> tp) const;
chr::local_info get_info(chr::local_time<Duration> tp) const;
template <class Duration>
date::sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_sys(date::local_time<Duration> tp) const;
chr::sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_sys(chr::local_time<Duration> tp) const;
template <class Duration>
date::sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_sys(date::local_time<Duration> tp, date::choose z) const;
chr::sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_sys(chr::local_time<Duration> tp, chr::choose z) const;
template <class Duration>
date::local_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_local(date::sys_time<Duration> tp) const;
chr::local_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_local(chr::sys_time<Duration> tp) const;
friend std::ostream& operator<<(std::ostream& os, const time_zone& z);
@@ -288,68 +318,68 @@ public:
friend bool operator==(const time_zone& x, const time_zone& y);
private:
date::sys_seconds get_start(date::year y) const;
date::sys_seconds get_prev_start(date::year y) const;
date::sys_seconds get_next_start(date::year y) const;
date::sys_seconds get_end(date::year y) const;
date::sys_seconds get_prev_end(date::year y) const;
date::sys_seconds get_next_end(date::year y) const;
date::sys_info contant_offset() const;
chr::sys_seconds get_start(chr::year y) const;
chr::sys_seconds get_prev_start(chr::year y) const;
chr::sys_seconds get_next_start(chr::year y) const;
chr::sys_seconds get_end(chr::year y) const;
chr::sys_seconds get_prev_end(chr::year y) const;
chr::sys_seconds get_next_end(chr::year y) const;
chr::sys_info contant_offset() const;
};
inline
date::sys_seconds
time_zone::get_start(date::year y) const
chr::sys_seconds
time_zone::get_start(chr::year y) const
{
return date::sys_seconds{(start_rule_(y) - offset_).time_since_epoch()};
return chr::sys_seconds{(start_rule_(y) - offset_).time_since_epoch()};
}
inline
date::sys_seconds
time_zone::get_prev_start(date::year y) const
chr::sys_seconds
time_zone::get_prev_start(chr::year y) const
{
return date::sys_seconds{(start_rule_(--y) - offset_).time_since_epoch()};
return chr::sys_seconds{(start_rule_(--y) - offset_).time_since_epoch()};
}
inline
date::sys_seconds
time_zone::get_next_start(date::year y) const
chr::sys_seconds
time_zone::get_next_start(chr::year y) const
{
return date::sys_seconds{(start_rule_(++y) - offset_).time_since_epoch()};
return chr::sys_seconds{(start_rule_(++y) - offset_).time_since_epoch()};
}
inline
date::sys_seconds
time_zone::get_end(date::year y) const
chr::sys_seconds
time_zone::get_end(chr::year y) const
{
return date::sys_seconds{(end_rule_(y) - (offset_ + save_)).time_since_epoch()};
return chr::sys_seconds{(end_rule_(y) - (offset_ + save_)).time_since_epoch()};
}
inline
date::sys_seconds
time_zone::get_prev_end(date::year y) const
chr::sys_seconds
time_zone::get_prev_end(chr::year y) const
{
return date::sys_seconds{(end_rule_(--y) - (offset_ + save_)).time_since_epoch()};
return chr::sys_seconds{(end_rule_(--y) - (offset_ + save_)).time_since_epoch()};
}
inline
date::sys_seconds
time_zone::get_next_end(date::year y) const
chr::sys_seconds
time_zone::get_next_end(chr::year y) const
{
return date::sys_seconds{(end_rule_(++y) - (offset_ + save_)).time_since_epoch()};
return chr::sys_seconds{(end_rule_(++y) - (offset_ + save_)).time_since_epoch()};
}
inline
date::sys_info
chr::sys_info
time_zone::contant_offset() const
{
using date::year;
using date::sys_info;
using date::sys_days;
using date::January;
using date::December;
using date::last;
using date::days;
using chr::year;
using chr::sys_info;
using chr::sys_days;
using chr::January;
using chr::December;
using chr::last;
using chr::days;
using std::chrono::minutes;
sys_info r;
r.begin = sys_days{year::min()/January/1};
@@ -364,7 +394,7 @@ time_zone::contant_offset() const
{
r.abbrev = dst_abbrev_;
r.offset = offset_ + save_;
r.save = date::ceil<minutes>(save_);
r.save = chr::ceil<minutes>(save_);
}
return r;
}
@@ -435,19 +465,19 @@ time_zone::time_zone(const detail::string_t& s)
}
template <class Duration>
date::sys_info
time_zone::get_info(date::sys_time<Duration> st) const
chr::sys_info
time_zone::get_info(chr::sys_time<Duration> st) const
{
using date::sys_info;
using date::year_month_day;
using date::sys_days;
using date::floor;
using date::ceil;
using date::days;
using date::year;
using date::January;
using date::December;
using date::last;
using chr::sys_info;
using chr::year_month_day;
using chr::sys_days;
using chr::floor;
using chr::ceil;
using chr::days;
using chr::year;
using chr::January;
using chr::December;
using chr::last;
using std::chrono::minutes;
sys_info r{};
r.offset = offset_;
@@ -517,23 +547,23 @@ time_zone::get_info(date::sys_time<Duration> st) const
}
template <class Duration>
date::local_info
time_zone::get_info(date::local_time<Duration> tp) const
chr::local_info
time_zone::get_info(chr::local_time<Duration> tp) const
{
using date::local_info;
using date::year_month_day;
using date::days;
using date::sys_days;
using date::sys_seconds;
using date::year;
using date::ceil;
using date::January;
using date::December;
using date::last;
using chr::local_info;
using chr::year_month_day;
using chr::days;
using chr::sys_days;
using chr::sys_seconds;
using chr::year;
using chr::ceil;
using chr::January;
using chr::December;
using chr::last;
using std::chrono::seconds;
using std::chrono::minutes;
local_info r{};
using date::floor;
using chr::floor;
if (start_rule_.ok())
{
auto y = year_month_day{floor<days>(tp)}.year();
@@ -591,13 +621,13 @@ time_zone::get_info(date::local_time<Duration> tp) const
}
template <class Duration>
date::sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
time_zone::to_sys(date::local_time<Duration> tp) const
chr::sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
time_zone::to_sys(chr::local_time<Duration> tp) const
{
using date::local_info;
using date::sys_time;
using date::ambiguous_local_time;
using date::nonexistent_local_time;
using chr::local_info;
using chr::sys_time;
using chr::ambiguous_local_time;
using chr::nonexistent_local_time;
auto i = get_info(tp);
if (i.result == local_info::nonexistent)
throw nonexistent_local_time(tp, i);
@@ -607,12 +637,12 @@ time_zone::to_sys(date::local_time<Duration> tp) const
}
template <class Duration>
date::sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
time_zone::to_sys(date::local_time<Duration> tp, date::choose z) const
chr::sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
time_zone::to_sys(chr::local_time<Duration> tp, chr::choose z) const
{
using date::local_info;
using date::sys_time;
using date::choose;
using chr::local_info;
using chr::sys_time;
using chr::choose;
auto i = get_info(tp);
if (i.result == local_info::nonexistent)
{
@@ -627,10 +657,10 @@ time_zone::to_sys(date::local_time<Duration> tp, date::choose z) const
}
template <class Duration>
date::local_time<typename std::common_type<Duration, std::chrono::seconds>::type>
time_zone::to_local(date::sys_time<Duration> tp) const
chr::local_time<typename std::common_type<Duration, std::chrono::seconds>::type>
time_zone::to_local(chr::sys_time<Duration> tp) const
{
using date::local_time;
using chr::local_time;
using std::chrono::seconds;
using LT = local_time<typename std::common_type<Duration, seconds>::type>;
auto i = get_info(tp);
@@ -641,10 +671,15 @@ inline
std::ostream&
operator<<(std::ostream& os, const time_zone& z)
{
using date::operator<<;
using chr::operator<<;
os << '{';
#if HAS_CHRONO_20
os << z.std_abbrev_ << ", " << z.dst_abbrev_ << ", " << std::format("{:%T, }", z.offset_)
<< std::format("{:%T, [}", z.save_) << z.start_rule_ << ", " << z.end_rule_ << ")}";
#else
os << z.std_abbrev_ << ", " << z.dst_abbrev_ << date::format(", %T, ", z.offset_)
<< date::format("%T, [", z.save_) << z.start_rule_ << ", " << z.end_rule_ << ")}";
#endif
return os;
}
@@ -652,7 +687,7 @@ inline
std::string
time_zone::name() const
{
using namespace date;
using namespace chr;
using namespace std::chrono;
auto print_abbrev = [](std::string const& nm)
{
@@ -669,7 +704,7 @@ time_zone::name() const
auto print_offset = [](seconds off)
{
std::string nm;
date::hh_mm_ss<seconds> offset{-off};
chr::hh_mm_ss<seconds> offset{-off};
if (offset.is_negative())
nm += '-';
nm += std::to_string(offset.hours().count());
@@ -746,8 +781,8 @@ inline
unsigned
read_date(const string_t& s, unsigned i, rule& r)
{
using date::month;
using date::weekday;
using chr::month;
using chr::weekday;
if (i == s.size())
throw_invalid(s, i, "Expected rule but found end of string");
if (s[i] == 'J')
@@ -911,7 +946,11 @@ read_unsigned(const string_t& s, unsigned i, unsigned limit, unsigned& u,
} // namespace Posix
#if HAS_CHRONO_20
namespace std::chrono
#else
namespace date
#endif
{
template <>
@@ -947,6 +986,6 @@ struct zoned_traits<Posix::time_zone>
};
} // namespace date
} // namespace chr
#endif // PTZ_H