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date/tz.h
Sascha Zelzer 641cd739c3 VS2013's std::vector does not support incomplete template types. 
This commit works around this by exposing the zonelet class declaration
to the public tz.h header.
2016-09-15 20:10:04 -04:00

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#ifndef TZ_H
#define TZ_H
// The MIT License (MIT)
//
// Copyright (c) 2015, 2016 Howard Hinnant
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//
// Our apologies. When the previous paragraph was written, lowercase had not yet
// been invented (that woud involve another several millennia of evolution).
// We did not mean to shout.
// Get more recent database at http://www.iana.org/time-zones
// The notion of "current timezone" is something the operating system is expected to "just
// know". How it knows this is system specific. It's often a value set by the user at OS
// intallation time and recorded by the OS somewhere. On Linux and Mac systems the current
// timezone name is obtained by looking at the name or contents of a particular file on
// disk. On Windows the current timzeone name comes from the registry. In either method,
// there is no guarantee that the "native" current timezone name obtained will match any
// of the "Standard" names in this library's "database". On Linux, the names usually do
// seem to match so mapping functions to map from native to "Standard" are typically not
// required. On Windows, the names are never "Standard" so mapping is always required.
// Technically any OS may use the mapping process but currently only Windows does use it.
#ifdef _WIN32
# ifndef TIMEZONE_MAPPING
# define TIMEZONE_MAPPING 1
# endif
#else
# ifdef TIMEZONE_MAPPING
# error "Timezone mapping is not required or not implemented for this platform."
# endif
#endif
#ifndef LAZY_INIT
# define LAZY_INIT 1
#endif
#ifndef HAS_REMOTE_API
# ifdef _WIN32
# define HAS_REMOTE_API 0
# else
# define HAS_REMOTE_API 1
# endif
#endif
#ifndef AUTO_DOWNLOAD
# define AUTO_DOWNLOAD HAS_REMOTE_API
#endif
static_assert(HAS_REMOTE_API == 0 ? AUTO_DOWNLOAD == 0 : true,
"AUTO_DOWNLOAD can not be turned on without HAS_REMOTE_API");
#ifndef USE_SHELL_API
# define USE_SHELL_API 0
#endif
#include "date.h"
#if defined(_MSC_VER) && (_MSC_VER < 1900)
#include "tz_private.h"
#endif
#include <algorithm>
#include <cassert>
#include <chrono>
#include <istream>
#include <locale>
#if LAZY_INIT
# include <memory>
# include <mutex>
#endif
#include <ostream>
#include <sstream>
#include <stdexcept>
#include <string>
#include <type_traits>
#include <utility>
#include <vector>
namespace date
{
enum class choose {earliest, latest};
namespace detail
{
struct undocumented;
}
class nonexistent_local_time
: public std::runtime_error
{
public:
template <class Duration>
nonexistent_local_time(local_time<Duration> tp, local_seconds first,
const std::string& first_abbrev, local_seconds last,
const std::string& last_abbrev, sys_seconds time_sys);
private:
template <class Duration>
static
std::string
make_msg(local_time<Duration> tp,
local_seconds first, const std::string& first_abbrev,
local_seconds last, const std::string& last_abbrev,
sys_seconds time_sys);
};
template <class Duration>
inline
nonexistent_local_time::nonexistent_local_time(local_time<Duration> tp,
local_seconds first,
const std::string& first_abbrev,
local_seconds last,
const std::string& last_abbrev,
sys_seconds time_sys)
: std::runtime_error(make_msg(tp, first, first_abbrev, last, last_abbrev, time_sys))
{}
template <class Duration>
std::string
nonexistent_local_time::make_msg(local_time<Duration> tp, local_seconds first,
const std::string& first_abbrev, local_seconds last,
const std::string& last_abbrev, sys_seconds time_sys)
{
using namespace date;
std::ostringstream os;
os << tp << " is in a gap between\n"
<< first << ' ' << first_abbrev << " and\n"
<< last << ' ' << last_abbrev
<< " which are both equivalent to\n"
<< time_sys << " UTC";
return os.str();
}
class ambiguous_local_time
: public std::runtime_error
{
public:
template <class Duration>
ambiguous_local_time(local_time<Duration> tp, std::chrono::seconds first_offset,
const std::string& first_abbrev,
std::chrono::seconds second_offset,
const std::string& second_abbrev);
private:
template <class Duration>
static
std::string
make_msg(local_time<Duration> tp,
std::chrono::seconds first_offset, const std::string& first_abbrev,
std::chrono::seconds second_offset, const std::string& second_abbrev);
};
template <class Duration>
inline
ambiguous_local_time::ambiguous_local_time(
local_time<Duration> tp,
std::chrono::seconds first_offset,
const std::string& first_abbrev,
std::chrono::seconds second_offset,
const std::string& second_abbrev)
: std::runtime_error(make_msg(tp, first_offset, first_abbrev, second_offset,
second_abbrev))
{}
template <class Duration>
std::string
ambiguous_local_time::make_msg(local_time<Duration> tp,
std::chrono::seconds first_offset,
const std::string& first_abbrev,
std::chrono::seconds second_offset,
const std::string& second_abbrev)
{
using namespace date;
std::ostringstream os;
os << tp << " is ambiguous. It could be\n"
<< tp << ' ' << first_abbrev << " == "
<< tp - first_offset << " UTC or\n"
<< tp << ' ' << second_abbrev << " == "
<< tp - second_offset << " UTC";
return os.str();
}
namespace detail { class Rule; }
struct sys_info
{
sys_seconds begin;
sys_seconds end;
std::chrono::seconds offset;
std::chrono::minutes save;
std::string abbrev;
};
std::ostream& operator<<(std::ostream& os, const sys_info& r);
struct local_info
{
enum {unique, nonexistent, ambiguous} result;
sys_info first;
sys_info second;
};
std::ostream& operator<<(std::ostream& os, const local_info& r);
class time_zone;
template <class Duration>
class zoned_time
{
const time_zone* zone_;
sys_time<Duration> tp_;
public:
zoned_time(sys_time<Duration> st);
explicit zoned_time(const time_zone* z);
explicit zoned_time(const std::string& name);
template <class Duration2,
class = typename std::enable_if
<
std::is_convertible<sys_time<Duration2>,
sys_time<Duration>>::value
>::type>
zoned_time(const zoned_time<Duration2>& zt) NOEXCEPT;
zoned_time(const time_zone* z, local_time<Duration> tp);
zoned_time(const std::string& name, local_time<Duration> tp);
zoned_time(const time_zone* z, local_time<Duration> tp, choose c);
zoned_time(const std::string& name, local_time<Duration> tp, choose c);
zoned_time(const time_zone* z, const zoned_time<Duration>& zt);
zoned_time(const std::string& name, const zoned_time<Duration>& zt);
zoned_time(const time_zone* z, const zoned_time<Duration>& zt, choose);
zoned_time(const std::string& name, const zoned_time<Duration>& zt, choose);
zoned_time(const time_zone* z, const sys_time<Duration>& st);
zoned_time(const std::string& name, const sys_time<Duration>& st);
zoned_time& operator=(sys_time<Duration> st);
zoned_time& operator=(local_time<Duration> ut);
operator sys_time<Duration>() const;
explicit operator local_time<Duration>() const;
const time_zone* get_time_zone() const;
local_time<Duration> get_local_time() const;
sys_time<Duration> get_sys_time() const;
sys_info get_info() const;
template <class Duration1, class Duration2>
friend
bool
operator==(const zoned_time<Duration1>& x, const zoned_time<Duration2>& y);
template <class CharT, class Traits, class Duration1>
friend
std::basic_ostream<CharT, Traits>&
operator<<(std::basic_ostream<CharT, Traits>& os, const zoned_time<Duration1>& t);
private:
template <class D> friend class zoned_time;
static_assert(std::is_convertible<std::chrono::seconds, Duration>::value,
"zoned_time must have a precision of seconds or finer");
};
using zoned_seconds = zoned_time<std::chrono::seconds>;
template <class Duration1, class Duration2>
inline
bool
operator==(const zoned_time<Duration1>& x, const zoned_time<Duration2>& y)
{
return x.zone_ == y.zone_ && x.tp_ == y.tp_;
}
template <class Duration1, class Duration2>
inline
bool
operator!=(const zoned_time<Duration1>& x, const zoned_time<Duration2>& y)
{
return !(x == y);
}
#if !defined(_MSC_VER) || (_MSC_VER >= 1900)
namespace detail { struct zonelet; }
#endif
class time_zone
{
private:
std::string name_;
std::vector<detail::zonelet> zonelets_;
#if LAZY_INIT
std::unique_ptr<std::once_flag> adjusted_;
#endif
public:
#if !defined(_MSC_VER) || (_MSC_VER >= 1900)
time_zone(time_zone&&) = default;
time_zone& operator=(time_zone&&) = default;
#else // defined(_MSC_VER) && (_MSC_VER < 1900)
time_zone(time_zone&& src);
time_zone& operator=(time_zone&& src);
#endif // defined(_MSC_VER) && (_MSC_VER < 1900)
explicit time_zone(const std::string& s, detail::undocumented);
const std::string& name() const;
template <class Duration> sys_info get_info(sys_time<Duration> st) const;
template <class Duration> local_info get_info(local_time<Duration> tp) const;
template <class Duration>
sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_sys(local_time<Duration> tp) const;
template <class Duration>
sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_sys(local_time<Duration> tp, choose z) const;
template <class Duration>
local_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_local(sys_time<Duration> tp) const;
friend bool operator==(const time_zone& x, const time_zone& y);
friend bool operator< (const time_zone& x, const time_zone& y);
friend std::ostream& operator<<(std::ostream& os, const time_zone& z);
void add(const std::string& s);
void adjust_infos(const std::vector<detail::Rule>& rules);
private:
sys_info get_info_impl(sys_seconds tp) const;
local_info get_info_impl(local_seconds tp) const;
sys_info get_info_impl(sys_seconds tp, int timezone) const;
void parse_info(std::istream& in);
template <class Duration>
sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_sys_impl(local_time<Duration> tp, choose z, std::false_type) const;
template <class Duration>
sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_sys_impl(local_time<Duration> tp, choose, std::true_type) const;
};
#if defined(_MSC_VER) && (_MSC_VER < 1900)
inline
time_zone::time_zone(time_zone&& src)
: name_(std::move(src.name_))
, zonelets_(std::move(src.zonelets_))
#if LAZY_INIT
, adjusted_(std::move(src.adjusted_))
#endif
{}
inline
time_zone&
time_zone::operator=(time_zone&& src)
{
name_ = std::move(src.name_);
zonelets_ = std::move(src.zonelets_);
#if LAZY_INIT
adjusted_ = std::move(src.adjusted_);
#endif
return *this;
}
#endif // defined(_MSC_VER) && (_MSC_VER < 1900)
inline
const std::string&
time_zone::name() const
{
return name_;
}
template <class Duration>
inline
sys_info
time_zone::get_info(sys_time<Duration> st) const
{
using namespace std::chrono;
return get_info_impl(floor<seconds>(st));
}
template <class Duration>
inline
local_info
time_zone::get_info(local_time<Duration> tp) const
{
using namespace std::chrono;
return get_info_impl(floor<seconds>(tp));
}
template <class Duration>
inline
sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
time_zone::to_sys(local_time<Duration> tp) const
{
return to_sys_impl(tp, choose{}, std::true_type{});
}
template <class Duration>
inline
sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
time_zone::to_sys(local_time<Duration> tp, choose z) const
{
return to_sys_impl(tp, z, std::false_type{});
}
template <class Duration>
inline
local_time<typename std::common_type<Duration, std::chrono::seconds>::type>
time_zone::to_local(sys_time<Duration> tp) const
{
using LT = local_time<typename std::common_type<Duration, std::chrono::seconds>::type>;
auto i = get_info(tp);
return LT{(tp + i.offset).time_since_epoch()};
}
inline bool operator==(const time_zone& x, const time_zone& y) {return x.name_ == y.name_;}
inline bool operator< (const time_zone& x, const time_zone& y) {return x.name_ < y.name_;}
inline bool operator!=(const time_zone& x, const time_zone& y) {return !(x == y);}
inline bool operator> (const time_zone& x, const time_zone& y) {return y < x;}
inline bool operator<=(const time_zone& x, const time_zone& y) {return !(y < x);}
inline bool operator>=(const time_zone& x, const time_zone& y) {return !(x < y);}
template <class Duration>
sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
time_zone::to_sys_impl(local_time<Duration> tp, choose z, std::false_type) const
{
using namespace date;
using namespace std::chrono;
auto i = get_info(tp);
if (i.result == local_info::nonexistent)
{
return i.first.end;
}
else if (i.result == local_info::ambiguous)
{
if (z == choose::latest)
return sys_time<Duration>{tp.time_since_epoch()} - i.second.offset;
}
return sys_time<Duration>{tp.time_since_epoch()} - i.first.offset;
}
template <class Duration>
sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
time_zone::to_sys_impl(local_time<Duration> tp, choose, std::true_type) const
{
using namespace date;
using namespace std::chrono;
auto i = get_info(tp);
if (i.result == local_info::nonexistent)
{
auto prev_end = local_seconds{i.first.end.time_since_epoch()} +
i.first.offset;
auto next_begin = local_seconds{i.second.begin.time_since_epoch()} +
i.second.offset;
throw nonexistent_local_time(tp, prev_end, i.first.abbrev,
next_begin, i.second.abbrev, i.first.end);
}
else if (i.result == local_info::ambiguous)
{
throw ambiguous_local_time(tp, i.first.offset, i.first.abbrev,
i.second.offset, i.second.abbrev);
}
return sys_time<Duration>{tp.time_since_epoch()} - i.first.offset;
}
class link
{
private:
std::string name_;
std::string target_;
public:
explicit link(const std::string& s);
const std::string& name() const {return name_;}
const std::string& target() const {return target_;}
friend bool operator==(const link& x, const link& y) {return x.name_ == y.name_;}
friend bool operator< (const link& x, const link& y) {return x.name_ < y.name_;}
friend std::ostream& operator<<(std::ostream& os, const link& x);
};
inline bool operator!=(const link& x, const link& y) {return !(x == y);}
inline bool operator> (const link& x, const link& y) {return y < x;}
inline bool operator<=(const link& x, const link& y) {return !(y < x);}
inline bool operator>=(const link& x, const link& y) {return !(x < y);}
class leap
{
private:
sys_seconds date_;
public:
explicit leap(const std::string& s, detail::undocumented);
sys_seconds date() const {return date_;}
friend bool operator==(const leap& x, const leap& y) {return x.date_ == y.date_;}
friend bool operator< (const leap& x, const leap& y) {return x.date_ < y.date_;}
template <class Duration>
friend
bool
operator==(const leap& x, const sys_time<Duration>& y)
{
return x.date_ == y;
}
template <class Duration>
friend
bool
operator< (const leap& x, const sys_time<Duration>& y)
{
return x.date_ < y;
}
template <class Duration>
friend
bool
operator< (const sys_time<Duration>& x, const leap& y)
{
return x < y.date_;
}
friend std::ostream& operator<<(std::ostream& os, const leap& x);
};
inline bool operator!=(const leap& x, const leap& y) {return !(x == y);}
inline bool operator> (const leap& x, const leap& y) {return y < x;}
inline bool operator<=(const leap& x, const leap& y) {return !(y < x);}
inline bool operator>=(const leap& x, const leap& y) {return !(x < y);}
template <class Duration>
inline
bool
operator==(const sys_time<Duration>& x, const leap& y)
{
return y == x;
}
template <class Duration>
inline
bool
operator!=(const leap& x, const sys_time<Duration>& y)
{
return !(x == y);
}
template <class Duration>
inline
bool
operator!=(const sys_time<Duration>& x, const leap& y)
{
return !(x == y);
}
template <class Duration>
inline
bool
operator> (const leap& x, const sys_time<Duration>& y)
{
return y < x;
}
template <class Duration>
inline
bool
operator> (const sys_time<Duration>& x, const leap& y)
{
return y < x;
}
template <class Duration>
inline
bool
operator<=(const leap& x, const sys_time<Duration>& y)
{
return !(y < x);
}
template <class Duration>
inline
bool
operator<=(const sys_time<Duration>& x, const leap& y)
{
return !(y < x);
}
template <class Duration>
inline
bool
operator>=(const leap& x, const sys_time<Duration>& y)
{
return !(x < y);
}
template <class Duration>
inline
bool
operator>=(const sys_time<Duration>& x, const leap& y)
{
return !(x < y);
}
#ifdef TIMEZONE_MAPPING
namespace detail
{
// The time zone mapping is modelled after this data file:
// http://unicode.org/repos/cldr/trunk/common/supplemental/windowsZones.xml
// and the field names match the element names from the mapZone element
// of windowsZones.xml.
// The website displays this file here:
// http://www.unicode.org/cldr/charts/latest/supplemental/zone_tzid.html
// The html view is sorted before being displayed but is otherwise the same
// There is a mapping between the os centric view (in this case windows)
// the html displays uses and the generic view the xml file.
// That mapping is this:
// display column "windows" -> xml field "other".
// display column "region" -> xml field "territory".
// display column "tzid" -> xml field "type".
// This structure uses the generic terminology because it could be
// used to to support other os/native name conversions, not just windows,
// and using the same generic names helps retain the connection to the
// origin of the data that we are using.
struct timezone_mapping
{
timezone_mapping(const char* other, const char* territory, const char* type)
: other(other), territory(territory), type(type)
{
}
timezone_mapping() = default;
std::string other;
std::string territory;
std::string type;
};
struct timezone_info
{
timezone_info() = default;
std::string timezone_id;
std::string standard_name;
};
} // detail
#endif // TIMEZONE_MAPPING
struct TZ_DB
{
std::string version;
std::vector<time_zone> zones;
std::vector<link> links;
std::vector<leap> leaps;
std::vector<detail::Rule> rules;
#ifdef TIMEZONE_MAPPING
// TODO! These need some protection.
std::vector<detail::timezone_mapping> mappings;
std::vector<detail::timezone_info> native_zones;
#endif
TZ_DB() = default;
#if !defined(_MSC_VER) || (_MSC_VER >= 1900)
TZ_DB(TZ_DB&&) = default;
TZ_DB& operator=(TZ_DB&&) = default;
#else // defined(_MSC_VER) || (_MSC_VER >= 1900)
TZ_DB(TZ_DB&& src)
:
version(std::move(src.version)),
zones(std::move(src.zones)),
links(std::move(src.links)),
leaps(std::move(src.leaps)),
rules(std::move(src.rules))
#ifdef TIMEZONE_MAPPING
,
mappings(std::move(src.mappings)),
native_zones(std::move(src.native_zones))
#endif
{}
TZ_DB& operator=(TZ_DB&& src)
{
version = std::move(src.version);
zones = std::move(src.zones);
links = std::move(src.links);
leaps = std::move(src.leaps);
rules = std::move(src.rules);
#ifdef TIMEZONE_MAPPING
mappings = std::move(src.mappings);
native_zones = std::move(src.native_zones);
#endif
return *this;
}
#endif // !defined(_MSC_VER) || (_MSC_VER >= 1900)
};
std::ostream&
operator<<(std::ostream& os, const TZ_DB& db);
const TZ_DB& get_tzdb();
const TZ_DB& reload_tzdb();
#if HAS_REMOTE_API
std::string remote_version();
bool remote_download(const std::string& version);
bool remote_install(const std::string& version);
#endif
const time_zone* locate_zone(const std::string& tz_name);
#ifdef TZ_TEST
# if _WIN32
const time_zone* locate_native_zone(const std::string& native_tz_name);
# endif // _WIN32
#endif // TZ_TEST
const time_zone* current_zone();
// zoned_time
template <class Duration>
inline
zoned_time<Duration>::zoned_time(sys_time<Duration> st)
: zone_(locate_zone("UTC"))
, tp_(st)
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const time_zone* z)
: zone_(z)
{assert(zone_ != nullptr);}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const std::string& name)
: zoned_time(locate_zone(name))
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const time_zone* z, local_time<Duration> t)
: zone_(z)
, tp_(z->to_sys(t))
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const std::string& name, local_time<Duration> t)
: zoned_time(locate_zone(name), t)
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const time_zone* z, local_time<Duration> t, choose c)
: zone_(z)
, tp_(z->to_sys(t, c))
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const std::string& name, local_time<Duration> t,
choose c)
: zoned_time(locate_zone(name), t, c)
{}
template <class Duration>
template <class Duration2, class>
inline
zoned_time<Duration>::zoned_time(const zoned_time<Duration2>& zt) NOEXCEPT
: zone_(zt.zone_)
, tp_(zt.tp_)
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const time_zone* z, const zoned_time<Duration>& zt)
: zone_(z)
, tp_(zt.tp_)
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const std::string& name, const zoned_time<Duration>& zt)
: zoned_time(locate_zone(name), zt)
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const time_zone* z, const zoned_time<Duration>& zt, choose)
: zoned_time(z, zt)
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const std::string& name,
const zoned_time<Duration>& zt, choose c)
: zoned_time(locate_zone(name), zt, c)
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const time_zone* z, const sys_time<Duration>& st)
: zone_(z)
, tp_(st)
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const std::string& name, const sys_time<Duration>& st)
: zoned_time(locate_zone(name), st)
{}
template <class Duration>
inline
zoned_time<Duration>&
zoned_time<Duration>::operator=(sys_time<Duration> st)
{
tp_ = st;
return *this;
}
template <class Duration>
inline
zoned_time<Duration>&
zoned_time<Duration>::operator=(local_time<Duration> ut)
{
tp_ = zone_->to_sys(ut);
return *this;
}
template <class Duration>
inline
zoned_time<Duration>::operator local_time<Duration>() const
{
return get_local_time();
}
template <class Duration>
inline
zoned_time<Duration>::operator sys_time<Duration>() const
{
return get_sys_time();
}
template <class Duration>
inline
const time_zone*
zoned_time<Duration>::get_time_zone() const
{
return zone_;
}
template <class Duration>
inline
local_time<Duration>
zoned_time<Duration>::get_local_time() const
{
return zone_->to_local(tp_);
}
template <class Duration>
inline
sys_time<Duration>
zoned_time<Duration>::get_sys_time() const
{
return tp_;
}
template <class Duration>
inline
sys_info
zoned_time<Duration>::get_info() const
{
return zone_->get_info(tp_);
}
// make_zoned_time
template <class Duration>
inline
zoned_time<typename std::common_type<Duration, std::chrono::seconds>::type>
make_zoned(sys_time<Duration> tp)
{
return {tp};
}
template <class Duration>
inline
zoned_time<typename std::common_type<Duration, std::chrono::seconds>::type>
make_zoned(const time_zone* zone, local_time<Duration> tp)
{
return {zone, tp};
}
template <class Duration>
inline
zoned_time<typename std::common_type<Duration, std::chrono::seconds>::type>
make_zoned(const std::string& name, local_time<Duration> tp)
{
return {name, tp};
}
template <class Duration>
inline
zoned_time<typename std::common_type<Duration, std::chrono::seconds>::type>
make_zoned(const time_zone* zone, local_time<Duration> tp, choose c)
{
return {zone, tp, c};
}
template <class Duration>
inline
zoned_time<typename std::common_type<Duration, std::chrono::seconds>::type>
make_zoned(const std::string& name, local_time<Duration> tp, choose c)
{
return {name, tp, c};
}
template <class Duration>
inline
zoned_time<typename std::common_type<Duration, std::chrono::seconds>::type>
make_zoned(const time_zone* zone, const zoned_time<Duration>& zt)
{
return {zone, zt};
}
template <class Duration>
inline
zoned_time<typename std::common_type<Duration, std::chrono::seconds>::type>
make_zoned(const std::string& name, const zoned_time<Duration>& zt)
{
return {name, zt};
}
template <class Duration>
inline
zoned_time<typename std::common_type<Duration, std::chrono::seconds>::type>
make_zoned(const time_zone* zone, const zoned_time<Duration>& zt, choose c)
{
return {zone, zt, c};
}
template <class Duration>
inline
zoned_time<typename std::common_type<Duration, std::chrono::seconds>::type>
make_zoned(const std::string& name, const zoned_time<Duration>& zt, choose c)
{
return {name, zt, c};
}
template <class Duration>
inline
zoned_time<typename std::common_type<Duration, std::chrono::seconds>::type>
make_zoned(const time_zone* zone, const sys_time<Duration>& st)
{
return {zone, st};
}
template <class Duration>
inline
zoned_time<typename std::common_type<Duration, std::chrono::seconds>::type>
make_zoned(const std::string& name, const sys_time<Duration>& st)
{
return {name, st};
}
template <class CharT, class Traits, class Duration>
inline
std::basic_ostream<CharT, Traits>&
operator<<(std::basic_ostream<CharT, Traits>& os, const zoned_time<Duration>& t)
{
auto i = t.zone_->get_info(t.tp_);
auto lt = t.tp_ + i.offset;
return os << lt << ' ' << i.abbrev;
}
class utc_clock
{
public:
using duration = std::chrono::system_clock::duration;
using rep = duration::rep;
using period = duration::period;
using time_point = std::chrono::time_point<utc_clock>;
static CONSTDATA bool is_steady = true;
static time_point now() NOEXCEPT;
template <class Duration>
static
std::chrono::time_point<utc_clock,
typename std::common_type<Duration, std::chrono::seconds>::type>
sys_to_utc(sys_time<Duration> t);
template <class Duration>
static
sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
utc_to_sys(std::chrono::time_point<utc_clock, Duration> t);
};
template <class Duration>
using utc_time = std::chrono::time_point<utc_clock, Duration>;
using utc_seconds = utc_time<std::chrono::seconds>;
inline
utc_clock::time_point
utc_clock::now() NOEXCEPT
{
using namespace std::chrono;
return sys_to_utc(system_clock::now());
}
template <class Duration>
utc_time<typename std::common_type<Duration, std::chrono::seconds>::type>
utc_clock::sys_to_utc(sys_time<Duration> t)
{
using namespace std::chrono;
using duration = typename std::common_type<Duration, seconds>::type;
auto const& leaps = get_tzdb().leaps;
auto const lt = std::upper_bound(leaps.begin(), leaps.end(), t);
return utc_time<duration>{t.time_since_epoch() + seconds{lt-leaps.begin()}};
}
template <class Duration>
sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
utc_clock::utc_to_sys(utc_time<Duration> t)
{
using namespace std::chrono;
using duration = typename std::common_type<Duration, seconds>::type;
auto const& leaps = get_tzdb().leaps;
auto tp = sys_time<duration>{t.time_since_epoch()};
if (tp >= leaps.front())
{
auto const lt = std::upper_bound(leaps.begin(), leaps.end(), tp);
tp -= seconds{lt-leaps.begin()};
if (tp < lt[-1])
{
if (tp >= lt[-1].date() - seconds{1})
tp = lt[-1].date() - duration{1};
else
tp += seconds{1};
}
}
return tp;
}
template <class Duration>
inline
sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_sys_time(utc_time<Duration> ut)
{
return utc_clock::utc_to_sys(ut);
}
template <class Duration>
inline
utc_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_utc_time(sys_time<Duration> st)
{
return utc_clock::sys_to_utc(st);
}
template <class CharT, class Traits, class Duration>
std::basic_ostream<CharT, Traits>&
operator<<(std::basic_ostream<CharT, Traits>& os, const utc_time<Duration>& t)
{
using namespace std::chrono;
using duration = typename std::common_type<Duration, seconds>::type;
auto const& leaps = get_tzdb().leaps;
auto tp = sys_time<duration>{t.time_since_epoch()};
if (tp >= leaps.front())
{
auto const lt = std::upper_bound(leaps.begin(), leaps.end(), tp);
tp -= seconds{lt-leaps.begin()};
if (tp < lt[-1])
{
if (tp >= lt[-1].date() - seconds{1})
{
auto const dp = floor<days>(tp);
auto time = make_time(tp-dp);
time.seconds() += seconds{1};
return os << year_month_day(dp) << ' ' << time;
}
else
tp += seconds{1};
}
}
return os << tp;
}
// tai_clock
class tai_clock
{
public:
using duration = std::chrono::system_clock::duration;
using rep = duration::rep;
using period = duration::period;
using time_point = std::chrono::time_point<tai_clock>;
static const bool is_steady = true;
static time_point now() NOEXCEPT;
template <class Duration>
static
std::chrono::time_point<tai_clock,
typename std::common_type<Duration, std::chrono::seconds>::type>
utc_to_tai(utc_time<Duration> t);
template <class Duration>
static
utc_time<typename std::common_type<Duration, std::chrono::seconds>::type>
tai_to_utc(std::chrono::time_point<tai_clock, Duration> t);
};
template <class Duration>
using tai_time = std::chrono::time_point<tai_clock, Duration>;
using tai_seconds = tai_time<std::chrono::seconds>;
template <class Duration>
tai_time<typename std::common_type<Duration, std::chrono::seconds>::type>
tai_clock::utc_to_tai(utc_time<Duration> t)
{
using namespace std::chrono;
using duration = typename std::common_type<Duration, seconds>::type;
return tai_time<duration>{t.time_since_epoch()} +
(sys_days{year{1970}/jan/1} - sys_days{year{1958}/jan/1} + seconds{10});
}
template <class Duration>
utc_time<typename std::common_type<Duration, std::chrono::seconds>::type>
tai_clock::tai_to_utc(tai_time<Duration> t)
{
using namespace std::chrono;
using duration = typename std::common_type<Duration, seconds>::type;
return utc_time<duration>{t.time_since_epoch()} -
(sys_days{year{1970}/jan/1} - sys_days{year{1958}/jan/1} + seconds{10});
}
template <class Duration>
inline
utc_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_utc_time(tai_time<Duration> t)
{
return tai_clock::tai_to_utc(t);
}
template <class Duration>
inline
tai_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_tai_time(utc_time<Duration> t)
{
return tai_clock::utc_to_tai(t);
}
inline
tai_clock::time_point
tai_clock::now() NOEXCEPT
{
using namespace std::chrono;
return to_tai_time(utc_clock::now());
}
template <class CharT, class Traits, class Duration>
std::basic_ostream<CharT, Traits>&
operator<<(std::basic_ostream<CharT, Traits>& os, const tai_time<Duration>& t)
{
using namespace std::chrono;
using duration = typename std::common_type<Duration, seconds>::type;
auto tp = sys_time<duration>{t.time_since_epoch()} -
(sys_days{year{1970}/jan/1} - sys_days{year{1958}/jan/1});
return os << tp;
}
// gps_clock
class gps_clock
{
public:
using duration = std::chrono::system_clock::duration;
using rep = duration::rep;
using period = duration::period;
using time_point = std::chrono::time_point<gps_clock>;
static const bool is_steady = true;
static time_point now() NOEXCEPT;
template <class Duration>
static
std::chrono::time_point<gps_clock,
typename std::common_type<Duration, std::chrono::seconds>::type>
utc_to_gps(utc_time<Duration> t);
template <class Duration>
static
utc_time<typename std::common_type<Duration, std::chrono::seconds>::type>
gps_to_utc(std::chrono::time_point<gps_clock, Duration> t);
};
template <class Duration>
using gps_time = std::chrono::time_point<gps_clock, Duration>;
using gps_seconds = gps_time<std::chrono::seconds>;
template <class Duration>
gps_time<typename std::common_type<Duration, std::chrono::seconds>::type>
gps_clock::utc_to_gps(utc_time<Duration> t)
{
using namespace std::chrono;
using duration = typename std::common_type<Duration, seconds>::type;
return gps_time<duration>{t.time_since_epoch()} -
(sys_days{year{1980}/jan/sun[1]} - sys_days{year{1970}/jan/1} + seconds{9});
}
template <class Duration>
utc_time<typename std::common_type<Duration, std::chrono::seconds>::type>
gps_clock::gps_to_utc(gps_time<Duration> t)
{
using namespace std::chrono;
using duration = typename std::common_type<Duration, seconds>::type;
return utc_time<duration>{t.time_since_epoch()} +
(sys_days{year{1980}/jan/sun[1]} - sys_days{year{1970}/jan/1} + seconds{9});
}
template <class Duration>
inline
utc_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_utc_time(gps_time<Duration> t)
{
return gps_clock::gps_to_utc(t);
}
template <class Duration>
inline
gps_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_gps_time(utc_time<Duration> t)
{
return gps_clock::utc_to_gps(t);
}
inline
gps_clock::time_point
gps_clock::now() NOEXCEPT
{
using namespace std::chrono;
return to_gps_time(utc_clock::now());
}
template <class CharT, class Traits, class Duration>
std::basic_ostream<CharT, Traits>&
operator<<(std::basic_ostream<CharT, Traits>& os, const gps_time<Duration>& t)
{
using namespace std::chrono;
using duration = typename std::common_type<Duration, seconds>::type;
auto tp = sys_time<duration>{t.time_since_epoch()} +
(sys_days{year{1980}/jan/sun[1]} - sys_days{year{1970}/jan/1});
return os << tp;
}
template <class Duration>
inline
sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_sys_time(tai_time<Duration> t)
{
return to_sys_time(to_utc_time(t));
}
template <class Duration>
inline
sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_sys_time(gps_time<Duration> t)
{
return to_sys_time(to_utc_time(t));
}
template <class Duration>
inline
tai_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_tai_time(sys_time<Duration> t)
{
return to_tai_time(to_utc_time(t));
}
template <class Duration>
inline
tai_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_tai_time(gps_time<Duration> t)
{
return to_tai_time(to_utc_time(t));
}
template <class Duration>
inline
gps_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_gps_time(sys_time<Duration> t)
{
return to_gps_time(to_utc_time(t));
}
template <class Duration>
inline
gps_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_gps_time(tai_time<Duration> t)
{
return to_gps_time(to_utc_time(t));
}
// 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)
{
auto const info = tp.get_info();
return detail::format(loc, std::move(fmt), tp.get_local_time(),
&info.abbrev, &info.offset);
}
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)
{
auto const info = tp.get_info();
return detail::format(std::locale{}, std::move(fmt), tp.get_local_time(),
&info.abbrev, &info.offset);
}
// 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);
}
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);
}
} // namespace date
#endif // TZ_H
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