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uchrono.h
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uchrono.h
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// This file is part of the uSTL library, an STL implementation.
//
// Copyright (c) 2016 by Mike Sharov <[email protected]>
// This file is free software, distributed under the MIT License.
#pragma once
#if HAVE_CPP11
#include "uratio.h"
#include <time.h>
namespace ustl {
namespace chrono {
//{{{ duration_cast ----------------------------------------------------
template <typename Rep, typename Period> struct duration;
template <typename ToDuration, typename Rep, typename Period>
struct __duration_cast_impl {
using to_rep = typename ToDuration::rep;
using conv_ratio = typename ratio_divide<Period, typename ToDuration::period>::type;
static inline ToDuration cast (const duration<Rep, Period>& d)
{ return ToDuration (static_cast<to_rep>(d.count()) * conv_ratio::num / conv_ratio::den); }
};
/// Converts durations of different periods or representations
template <typename ToDuration, typename Rep, typename Period>
ToDuration duration_cast (const duration<Rep, Period>& d)
{ return __duration_cast_impl<ToDuration,Rep,Period>::cast (d); }
//}}}-------------------------------------------------------------------
//{{{ duration_values and treat_as_floating_point
template <typename Rep>
struct duration_values {
static constexpr Rep zero (void) { return Rep(0); }
static constexpr Rep min (void) { return numeric_limits<Rep>::lowest(); }
static constexpr Rep max (void) { return numeric_limits<Rep>::max(); }
};
template <typename Rep>
struct treat_as_floating_point : public is_floating_point<Rep> {};
//}}}-------------------------------------------------------------------
//{{{ duration
/// Stores a time duration
template <typename Rep, typename Period = ratio<1>>
struct duration {
using rep = Rep;
using period = Period;
// Automatic conversion ctors enabled if lossless
template <typename Rep2, typename = typename
enable_if<is_convertible<Rep2, rep>::value
&& (treat_as_floating_point<rep>::value
|| numeric_limits<Rep2>::is_integer)>::type>
inline constexpr explicit duration (const Rep2& v)
: _r (v) {}
template <typename Rep2, typename Period2, typename = typename
enable_if<treat_as_floating_point<rep>::value
|| (ratio_divide<Period2, period>::den == 1
&& numeric_limits<Rep2>::is_integer)>::type>
inline constexpr duration (const duration<Rep2, Period2>& v)
: _r (duration_cast<duration>(v).count()) {}
constexpr duration (void) = default;
constexpr duration (const duration& d) = default;
~duration (void) = default;
duration& operator= (const duration&) = default;
inline constexpr const rep& count (void) const { return _r; }
inline constexpr duration operator+ (void) const { return *this; }
inline constexpr duration operator- (void) const { return duration(-count()); }
inline duration& operator++ (void) { ++_r; return *this; }
inline duration operator++ (int) { return duration(_r++); }
inline duration& operator-- (void) { --_r; return *this; }
inline duration operator-- (int) { return duration(_r--); }
inline duration& operator+= (const duration& v) { _r += v.count(); return *this; }
inline duration& operator-= (const duration& v) { _r -= v.count(); return *this; }
inline duration& operator*= (const rep& v) { _r *= v; return *this; }
inline duration& operator/= (const rep& v) { _r /= v; return *this; }
inline duration operator+ (const duration& v) const { return duration (_r + v.count()); }
inline duration operator- (const duration& v) const { return duration (_r - v.count()); }
// Mod allowed only for integers
template <typename Rep2 = rep> typename enable_if<numeric_limits<Rep2>::is_integer,
duration&>::type operator%= (const rep& v) { _r %= v; return *this; }
template <typename Rep2 = rep> typename enable_if<numeric_limits<Rep2>::is_integer,
duration&>::type operator%= (const duration& v) { _r %= v.count(); return *this; }
inline constexpr bool operator== (const duration& v) const { return count() == v.count(); }
inline constexpr bool operator< (const duration& v) const { return count() < v.count(); }
// Comparisons with different duration types are allowed when implicitly convertible
template <typename Rep2, typename Period2>
inline constexpr typename enable_if<
ratio_greater<ratio_divide<period,Period2>,ratio<1>>::value
&& is_convertible<duration,duration<Rep2,Period2>>::value,
bool>::type operator== (const duration<rep,Period2>& v) const
{ return duration<Rep2,Period2>(*this) == v; }
template <typename Rep2, typename Period2>
inline constexpr typename enable_if<
ratio_less_equal<ratio_divide<period,Period2>,ratio<1>>::value
&& is_convertible<duration,duration<Rep2,Period2>>::value,
bool>::type operator== (const duration<rep,Period2>& v) const
{ return operator== (duration(v)); }
template <typename Rep2, typename Period2>
inline constexpr typename enable_if<
ratio_greater<ratio_divide<period,Period2>,ratio<1>>::value
&& is_convertible<duration,duration<Rep2,Period2>>::value,
bool>::type operator< (const duration<rep,Period2>& v) const
{ return duration<Rep2,Period2>(*this) < v; }
template <typename Rep2, typename Period2>
inline constexpr typename enable_if<
ratio_less_equal<ratio_divide<period,Period2>,ratio<1>>::value
&& is_convertible<duration,duration<Rep2,Period2>>::value,
bool>::type operator< (const duration<rep,Period2>& v) const
{ return operator< (duration(v)); }
inline void read (istream& is) { is >> _r; }
inline void write (ostream& os) const { os << _r; }
inline streamsize stream_size (void) const { return stream_size_of(_r); }
inline void text_write (ostringstream& os) const;
// Named ctors for special values
static constexpr duration zero (void) { return duration (duration_values<rep>::zero()); }
static constexpr duration min (void) { return duration (duration_values<rep>::min()); }
static constexpr duration max (void) { return duration (duration_values<rep>::max()); }
private:
rep _r;
};
template <typename Duration>
struct duration_text_write {
static inline void text_write (ostringstream& os, const typename Duration::rep& r) { os << r; }
};
template <typename R, typename P>
void duration<R,P>::text_write (ostringstream& os) const { duration_text_write<duration<R,P>>::text_write(os,_r); }
//}}}-------------------------------------------------------------------
//{{{ Standard durations
using nanoseconds = duration<intmax_t, nano>;
using microseconds = duration<intmax_t, micro>;
using milliseconds = duration<intmax_t, milli>;
using seconds = duration<intmax_t>;
using minutes = duration<intmax_t, ratio<60>>;
using hours = duration<intmax_t, ratio<minutes::period::num*60>>;
using days = duration<intmax_t, ratio<hours::period::num*24>>;
using weeks = duration<intmax_t, ratio<days::period::num*7>>;
using years = duration<intmax_t, ratio<365*days::period::num+days::period::num/4>>;
using months = duration<intmax_t, ratio<years::period::num/12>>;
using centuries = duration<intmax_t, ratio<years::period::num*100>>;
using millenia = duration<intmax_t, ratio<years::period::num*1000>>;
#define DURATION_TEXT_SUFFIX(d,suffix) \
template <> struct duration_text_write<d> { \
static inline void text_write (ostringstream& os, const typename d::rep& r) \
{ os << r << suffix; }}
DURATION_TEXT_SUFFIX (nanoseconds, "_ns");
DURATION_TEXT_SUFFIX (microseconds, "_us");
DURATION_TEXT_SUFFIX (milliseconds, "_ms");
DURATION_TEXT_SUFFIX (seconds, "_s");
DURATION_TEXT_SUFFIX (minutes, "_min");
DURATION_TEXT_SUFFIX (hours, "_hours");
DURATION_TEXT_SUFFIX (days, "_days");
DURATION_TEXT_SUFFIX (weeks, "_weeks");
DURATION_TEXT_SUFFIX (years, "_years");
DURATION_TEXT_SUFFIX (months, "_months");
DURATION_TEXT_SUFFIX (centuries, "_centuries");
DURATION_TEXT_SUFFIX (millenia, "_millenia");
//}}}-------------------------------------------------------------------
//{{{ hrtime_t
// Extends struct timespec, used by libc time functions, as an arithmetic type
struct hrtime_t : public timespec {
inline constexpr hrtime_t (void) : timespec(){}
hrtime_t (const hrtime_t&) = default;
hrtime_t& operator= (const hrtime_t&) = default;
inline explicit constexpr hrtime_t (const timespec& v) : timespec(v){}
inline constexpr hrtime_t (time_t s, long ns) : timespec{s,ns}{}
inline explicit constexpr hrtime_t (intmax_t v) : timespec{v/nano::den,v%nano::den}{}
inline explicit constexpr hrtime_t (float v) : timespec{time_t(v),time_t((v-time_t(v))*nano::den)}{}
inline explicit constexpr hrtime_t (double v) : timespec{time_t(v),time_t((v-time_t(v))*nano::den)}{}
inline constexpr operator intmax_t (void) const { return intmax_t(tv_sec)*nano::den + tv_nsec; }
inline constexpr operator float (void) const { return float(tv_nsec)/nano::den + tv_sec; }
inline constexpr operator double (void) const { return double(tv_nsec)/nano::den + tv_sec; }
inline constexpr hrtime_t operator+ (void) const { return *this; }
inline constexpr hrtime_t operator- (void) const { return hrtime_t(-tv_sec,-tv_nsec); }
hrtime_t& operator++ (void) {
if (++tv_nsec > nano::den) {
tv_nsec -= nano::den;
++tv_sec;
}
return *this;
}
hrtime_t& operator-- (void) {
if (!tv_nsec) {
tv_nsec = nano::den;
--tv_sec;
}
--tv_nsec;
return *this;
}
inline hrtime_t operator++ (int) { hrtime_t r(*this); operator++(); return r; }
inline hrtime_t operator-- (int) { hrtime_t r(*this); operator--(); return r; }
hrtime_t& operator+= (const hrtime_t& v) {
if (nano::den <= (tv_nsec += v.tv_nsec)) {
tv_nsec -= nano::den;
++tv_sec;
}
tv_sec += v.tv_sec;
return *this;
}
hrtime_t& operator-= (const hrtime_t& v) {
if (0 > (tv_nsec -= v.tv_nsec)) {
tv_nsec += nano::den;
--tv_sec;
}
tv_sec -= v.tv_sec;
return *this;
}
hrtime_t& operator*= (intmax_t v) {
tv_sec *= v;
if (nano::den <= (tv_nsec *= v)) {
tv_sec += tv_nsec / nano::den;
tv_nsec %= nano::den;
}
return *this;
}
hrtime_t& operator/= (intmax_t v) {
tv_nsec /= v;
tv_nsec += (tv_sec % v) * nano::den;
tv_sec /= v;
return *this;
}
inline hrtime_t operator+ (const hrtime_t& v) const { hrtime_t r(*this); return r += v; }
inline hrtime_t operator- (const hrtime_t& v) const { hrtime_t r(*this); return r -= v; }
inline hrtime_t operator* (intmax_t v) const { hrtime_t r(*this); return r *= v; }
inline hrtime_t operator/ (intmax_t v) const { hrtime_t r(*this); return r /= v; }
inline constexpr bool operator== (const hrtime_t& v) const { return tv_sec == v.tv_sec && tv_nsec == v.tv_nsec; }
inline constexpr bool operator< (const hrtime_t& v) const { return tv_sec < v.tv_sec || (tv_sec == v.tv_sec && tv_nsec < v.tv_nsec); }
inline void read (istream& is) { is >> tv_sec >> tv_nsec; }
inline void write (ostream& os) const { os << tv_sec << tv_nsec; }
void text_write (ostringstream& os) const { os.format ("%ld.%09ld", tv_sec, tv_nsec); }
inline streamsize stream_size (void) const { return stream_size_of(tv_sec) + stream_size_of(tv_nsec); }
};
// numeric_limits<hrtime_t>::min,max will always return 0
template <> struct duration_values<hrtime_t> {
static constexpr hrtime_t zero (void)
{ return hrtime_t(); }
static constexpr hrtime_t min (void)
{ return hrtime_t (numeric_limits<decltype(hrtime_t::tv_sec)>::lowest(), nano::den-1); }
static constexpr hrtime_t max (void)
{ return hrtime_t (numeric_limits<decltype(hrtime_t::tv_sec)>::max(), nano::den-1); }
};
// timespec has a very high resolution, so is convertible as float
template <> struct treat_as_floating_point<hrtime_t> : public true_type {};
// Override duration_cast to avoid intermediate conversion to intmax_t nanoseconds
template <typename ToDuration, typename Period>
struct __duration_cast_impl<ToDuration, hrtime_t, Period> {
using to_rep = typename ToDuration::rep;
using ns_conv_ratio = typename ratio_divide<Period, typename ToDuration::period>::type;
using s_conv_ratio = typename ratio_divide<ns_conv_ratio, Period>::type;
static inline ToDuration cast (const duration<hrtime_t, Period>& d) {
auto& t = d.count();
return ToDuration (
static_cast<to_rep>(t.tv_sec) * s_conv_ratio::num / s_conv_ratio::den
+ static_cast<to_rep>(t.tv_nsec) * ns_conv_ratio::num / ns_conv_ratio::den);
}
};
//}}}-------------------------------------------------------------------
//{{{ time_point
template <typename Clock, typename Duration> struct time_point;
template <typename ToDuration, typename Clock, typename FromDuration>
constexpr time_point<Clock, ToDuration> time_point_cast (const time_point<Clock, FromDuration>& tp)
{ return time_point<Clock,ToDuration> (duration_cast<ToDuration> (tp.time_since_epoch())); }
template <typename Clock, typename Duration = typename Clock::duration>
struct time_point {
using clock = Clock;
using duration = Duration;
using rep = typename duration::rep;
using period = typename duration::period;
constexpr time_point (void) = default;
constexpr explicit time_point (const duration& t) : _t(t) {}
template <typename Duration2, typename = typename enable_if<is_convertible<Duration2,duration>::value>::type>
inline constexpr time_point (const time_point<clock, Duration2>& t)
:_t (t.time_since_epoch()) {}
constexpr const duration& time_since_epoch (void) const { return _t; }
inline time_point& operator+= (const duration& t) { _t += t; return *this; }
inline time_point& operator-= (const duration& t) { _t -= t; return *this; }
inline time_point operator- (const duration& t) const { return time_point(_t - t); }
inline time_point operator+ (const duration& t) const { return time_point(_t + t); }
template <typename Duration2 = duration>
inline duration operator- (const time_point<clock,Duration2>& t) const
{ return _t - t.time_since_epoch(); }
template <typename Duration2 = duration>
inline constexpr bool operator== (const time_point<clock,Duration2>& t) const
{ return time_since_epoch() == t.time_since_epoch(); }
template <typename Duration2 = duration>
inline constexpr bool operator< (const time_point<clock,Duration2>& t) const
{ return time_since_epoch() < t.time_since_epoch(); }
inline void read (istream& is) { is >> _t; }
inline void write (ostream& os) const { os << _t; }
inline streamsize stream_size (void) const { return stream_size_of(_t); }
inline void text_write (ostringstream& os) const;
static constexpr time_point zero (void) { return time_point (duration::zero()); }
static constexpr time_point min (void) { return time_point (duration::min()); }
static constexpr time_point max (void) { return time_point (duration::max()); }
private:
duration _t;
};
template <typename TimePoint>
struct time_point_text_write {
static inline void text_write (ostringstream& os, const TimePoint& r) { os << r.time_since_epoch(); }
};
template <typename C, typename D>
void time_point<C,D>::text_write (ostringstream& os) const { time_point_text_write<time_point<C,D>>::text_write(os,*this); }
//}}}-------------------------------------------------------------------
//{{{ system_clock
struct system_clock {
using duration = seconds;
using rep = typename duration::rep;
using period = typename duration::period;
using time_point = ::ustl::chrono::time_point<system_clock, duration>;
static inline time_t to_time_t (const time_point& tp) noexcept
{ return static_cast<time_t>(tp.time_since_epoch().count()); }
static inline time_point from_time_t (time_t t) noexcept
{ return time_point (duration (t)); }
static inline time_point now (void) noexcept
{ return from_time_t (time (nullptr)); }
static constexpr bool is_steady = false;
};
template <> struct time_point_text_write<system_clock::time_point> {
static inline void text_write (ostringstream& os, const system_clock::time_point& tp) {
auto tt = system_clock::to_time_t (tp);
auto tstr = ctime (&tt);
if (!tstr)
return;
tstr[strlen(tstr)-1] = 0; // remove trailing newline
os << tstr;
}
};
//}}}-------------------------------------------------------------------
//{{{ high_resolution_clock
struct high_resolution_clock {
using duration = ::ustl::chrono::duration<hrtime_t, nano>;
using rep = typename duration::rep;
using period = typename duration::period;
using time_point = ::ustl::chrono::time_point<high_resolution_clock, duration>;
protected:
static inline rep rep_now (clockid_t clkid) noexcept
{ rep ts; clock_gettime (clkid, &ts); return ts; }
public:
static time_point now (void) noexcept
{ return time_point (duration (rep_now (CLOCK_REALTIME))); }
static constexpr bool is_steady = false;
};
//}}}-------------------------------------------------------------------
//{{{ steady_clock
// Monotonically increasing clock
struct steady_clock : public high_resolution_clock {
using duration = nanoseconds;
using rep = typename duration::rep;
using period = typename duration::period;
using time_point = ::ustl::chrono::time_point<steady_clock, duration>;
public:
static time_point now (void) noexcept {
return time_point (
duration_cast<duration>(
high_resolution_clock::duration(
rep_now (CLOCK_MONOTONIC))));
}
static constexpr bool is_steady = true;
};
//}}}-------------------------------------------------------------------
//{{{ system_clock_hr
// High resolution version of system_clock, storing a single intmax_t instead of timespec
template <typename Duration = milliseconds>
struct system_clock_hr : public high_resolution_clock {
using duration = Duration;
using rep = typename duration::rep;
using period = typename duration::period;
using time_point = ::ustl::chrono::time_point<system_clock_hr, duration>;
public:
static time_point now (void) noexcept {
return time_point (
duration_cast<duration>(
high_resolution_clock::duration(
rep_now (CLOCK_REALTIME))));
}
};
// Specific resolution aliases for getting time_points at given resolution.
// This simplifies the very common use of timing blocks of code.
using system_clock_ms = system_clock_hr<milliseconds>;
using system_clock_us = system_clock_hr<microseconds>;
using system_clock_ns = system_clock_hr<nanoseconds>;
//}}}-------------------------------------------------------------------
} // namespace chrono
} // namespace ustl
#endif // HAVE_CPP11