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Simplify redundant code, conform to style suggestions, improve logic

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This commit is contained in:
Trent Houliston 2016-09-28 01:01:44 +10:00
parent 253e41ccad
commit a3603e6df0
1 changed files with 61 additions and 78 deletions
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139
include/pybind11/chrono.h
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@ -12,16 +12,30 @@
#include "pybind11.h"
#include <cmath>
#include <ctime>
#include <chrono>
#include <datetime.h>
// Backport the PyDateTime_DELTA functions from Python3.3 if required
#ifndef PyDateTime_DELTA_GET_DAYS
#define PyDateTime_DELTA_GET_DAYS(o) (((PyDateTime_Delta*)o)->days)
#endif
#ifndef PyDateTime_DELTA_GET_SECONDS
#define PyDateTime_DELTA_GET_SECONDS(o) (((PyDateTime_Delta*)o)->seconds)
#endif
#ifndef PyDateTime_DELTA_GET_MICROSECONDS
#define PyDateTime_DELTA_GET_MICROSECONDS(o) (((PyDateTime_Delta*)o)->microseconds)
#endif
NAMESPACE_BEGIN(pybind11)
NAMESPACE_BEGIN(detail)
template <typename Rep, typename Period> class type_caster<std::chrono::duration<Rep, Period>> {
template <typename type> class duration_caster {
public:
typedef std::chrono::duration<Rep, Period> type;
typedef std::chrono::duration<std::chrono::hours::rep, std::ratio<86400>> days;
typedef typename type::rep rep;
typedef typename type::period period;
typedef std::chrono::duration<uint_fast32_t, std::ratio<86400>> days;
bool load(handle src, bool) {
using namespace std::chrono;
@ -30,29 +44,40 @@ public:
if (!PyDateTimeAPI) { PyDateTime_IMPORT; }
if (!src) return false;
// If they have passed us a datetime.delta object
// If invoked with datetime.delta object
if (PyDelta_Check(src.ptr())) {
// The accessor macros for timedelta exist in some versions of python but not others (e.g. Mac OSX default python)
// Therefore we are just doing what the macros do explicitly
const PyDateTime_Delta* delta = reinterpret_cast<PyDateTime_Delta*>(src.ptr());
value = duration_cast<duration<Rep, Period>>(
days(delta->days)
+ seconds(delta->seconds)
+ microseconds(delta->microseconds));
value = type(duration_cast<duration<rep, period>>(
days(PyDateTime_DELTA_GET_DAYS(src.ptr()))
+ seconds(PyDateTime_DELTA_GET_SECONDS(src.ptr()))
+ microseconds(PyDateTime_DELTA_GET_MICROSECONDS(src.ptr()))));
return true;
}
// If they have passed us a float we can assume it is seconds and convert
// If invoked with a float we assume it is seconds and convert
else if (PyFloat_Check(src.ptr())) {
double val = PyFloat_AsDouble(src.ptr());
// Multiply by the reciprocal of the ratio and round
value = type(std::lround(val * type::period::den / type::period::num));
value = type(duration_cast<duration<rep, period>>(duration<double>(PyFloat_AsDouble(src.ptr()))));
return true;
}
else return false;
}
static handle cast(const std::chrono::duration<Rep, Period> &src, return_value_policy /* policy */, handle /* parent */) {
// If this is a duration just return it back
static const std::chrono::duration<rep, period>& get_duration(const std::chrono::duration<rep, period> &src) {
return src;
}
// If this is a time_point get the time_since_epoch
template <typename Clock> static std::chrono::duration<rep, period> get_duration(const std::chrono::time_point<Clock, std::chrono::duration<rep, period>> &src) {
return src.time_since_epoch();
}
static handle cast(const type &src, return_value_policy /* policy */, handle /* parent */) {
using namespace std::chrono;
// Use overloaded function to get our duration from our source
// Works out if it is a duration or time_point and get the duration
auto d = get_duration(src);
// Lazy initialise the PyDateTime import
if (!PyDateTimeAPI) { PyDateTime_IMPORT; }
// Declare these special duration types so the conversions happen with the correct primitive types (int)
@ -60,11 +85,11 @@ public:
using ss_t = duration<int, std::ratio<1>>;
using us_t = duration<int, std::micro>;
return PyDelta_FromDSU(
duration_cast<dd_t>(src).count()
, duration_cast<ss_t>(src % days(1)).count()
, duration_cast<us_t>(src % seconds(1)).count());
return PyDelta_FromDSU(duration_cast<dd_t>(d).count(),
duration_cast<ss_t>(d % days(1)).count(),
duration_cast<us_t>(d % seconds(1)).count());
}
PYBIND11_TYPE_CASTER(type, _("datetime.timedelta"));
};
@ -89,7 +114,7 @@ public:
cal.tm_year = PyDateTime_GET_YEAR(src.ptr()) - 1900;
cal.tm_isdst = -1;
value = system_clock::from_time_t(mktime(&cal)) + microseconds(PyDateTime_DATE_GET_MICROSECOND(src.ptr()));
value = system_clock::from_time_t(std::mktime(&cal)) + microseconds(PyDateTime_DATE_GET_MICROSECOND(src.ptr()));
return true;
}
else return false;
@ -101,21 +126,21 @@ public:
// Lazy initialise the PyDateTime import
if (!PyDateTimeAPI) { PyDateTime_IMPORT; }
time_t tt = system_clock::to_time_t(src);
std::time_t tt = system_clock::to_time_t(src);
// this function uses static memory so it's best to copy it out asap just in case
tm *ltime = localtime(&tt);
tm localtime = *ltime;
// otherwise other code that is using localtime may break this (not just python code)
std::tm localtime = *std::localtime(&tt);
// Declare these special duration types so the conversions happen with the correct primitive types (int)
using us_t = duration<int, std::micro>;
return PyDateTime_FromDateAndTime(localtime.tm_year + 1900
, localtime.tm_mon + 1
, localtime.tm_mday
, localtime.tm_hour
, localtime.tm_min
, localtime.tm_sec
, (duration_cast<us_t>(src.time_since_epoch() % seconds(1))).count());
return PyDateTime_FromDateAndTime(localtime.tm_year + 1900,
localtime.tm_mon + 1,
localtime.tm_mday,
localtime.tm_hour,
localtime.tm_min,
localtime.tm_sec,
(duration_cast<us_t>(src.time_since_epoch() % seconds(1))).count());
}
PYBIND11_TYPE_CASTER(type, _("datetime.datetime"));
};
@ -123,54 +148,12 @@ public:
// Other clocks that are not the system clock are not measured as datetime.datetime objects
// since they are not measured on calendar time. So instead we just make them timedeltas
// Or if they have passed us a time as a float we convert that
template <typename Clock, typename Duration> class type_caster<std::chrono::time_point<Clock, Duration>> {
public:
typedef std::chrono::time_point<Clock, Duration> type;
typedef std::chrono::duration<std::chrono::hours::rep, std::ratio<86400>> days;
template <typename Clock, typename Duration> class type_caster<std::chrono::time_point<Clock, Duration>>
: public duration_caster<std::chrono::time_point<Clock, Duration>> {
};
bool load(handle src, bool) {
using namespace std::chrono;
if (!PyDateTimeAPI) { PyDateTime_IMPORT; }
// If they have passed us a datetime.delta object
if (PyDelta_Check(src.ptr())) {
// The accessor macros for timedelta exist in some versions of python but not others (e.g. Mac OSX default python)
// Therefore we are just doing what the macros do explicitly
const PyDateTime_Delta* delta = reinterpret_cast<PyDateTime_Delta*>(src.ptr());
value = time_point<Clock, Duration>(
days(delta->days)
+ seconds(delta->seconds)
+ microseconds(delta->microseconds));
return true;
}
// If they have passed us a float we can assume it is seconds and convert
else if (PyFloat_Check(src.ptr())) {
double val = PyFloat_AsDouble(src.ptr());
value = time_point<Clock, Duration>(Duration(std::lround((val / Clock::period::num) * Clock::period::den)));
return true;
}
else return false;
}
static handle cast(const std::chrono::time_point<Clock, Duration> &src, return_value_policy /* policy */, handle /* parent */) {
using namespace std::chrono;
// Lazy initialise the PyDateTime import
if (!PyDateTimeAPI) { PyDateTime_IMPORT; }
// Declare these special duration types so the conversions happen with the correct primitive types (int)
using dd_t = duration<int, std::ratio<86400>>;
using ss_t = duration<int, std::ratio<1>>;
using us_t = duration<int, std::micro>;
Duration d = src.time_since_epoch();
return PyDelta_FromDSU(
duration_cast<dd_t>(d).count()
, duration_cast<ss_t>(d % days(1)).count()
, duration_cast<us_t>(d % seconds(1)).count());
}
PYBIND11_TYPE_CASTER(type, _("datetime.timedelta"));
template <typename Rep, typename Period> class type_caster<std::chrono::duration<Rep, Period>>
: public duration_caster<std::chrono::duration<Rep, Period>> {
};
NAMESPACE_END(detail)