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Implement P0092R1 for C++1z

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@252195 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Marshall Clow
2015-11-05 19:33:59 +00:00
parent c010bd6289
commit 223df2ef0f
16 changed files with 713 additions and 1 deletions
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123
include/chrono
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@@ -194,6 +194,13 @@ template <class Rep1, class Period1, class Rep2, class Period2>
template <class ToDuration, class Rep, class Period>
ToDuration duration_cast(const duration<Rep, Period>& d);
template <class ToDuration, class Rep, class Period>
constexpr ToDuration floor(const duration<Rep, Period>& d); // C++17
template <class ToDuration, class Rep, class Period>
constexpr ToDuration ceil(const duration<Rep, Period>& d); // C++17
template <class ToDuration, class Rep, class Period>
constexpr ToDuration round(const duration<Rep, Period>& d); // C++17
// time_point arithmetic (all constexpr in C++14)
template <class Clock, class Duration1, class Rep2, class Period2>
time_point<Clock, typename common_type<Duration1, duration<Rep2, Period2>>::type>
@@ -227,6 +234,20 @@ template <class Clock, class Duration1, class Duration2>
template <class ToDuration, class Clock, class Duration>
time_point<Clock, ToDuration> time_point_cast(const time_point<Clock, Duration>& t);
template <class ToDuration, class Clock, class Duration>
constexpr time_point<Clock, ToDuration>
floor(const time_point<Clock, Duration>& tp); // C++17
template <class ToDuration, class Clock, class Duration>
constexpr time_point<Clock, ToDuration>
ceil(const time_point<Clock, Duration>& tp); // C++17
template <class ToDuration, class Clock, class Duration>
constexpr time_point<Clock, ToDuration>
round(const time_point<Clock, Duration>& tp); // C++17
template <class Rep, class Period>
constexpr duration<Rep, Period> abs(duration<Rep, Period> d); // C++17
// Clocks
class system_clock
@@ -401,6 +422,58 @@ public:
_LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR _Rep min() {return numeric_limits<_Rep>::lowest();}
};
#if _LIBCPP_STD_VER > 14
template <class _ToDuration, class _Rep, class _Period>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
typename enable_if
<
__is_duration<_ToDuration>::value,
_ToDuration
>::type
floor(const duration<_Rep, _Period>& __d)
{
_ToDuration __t = duration_cast<_ToDuration>(__d);
if (__t > __d)
__t = __t - _ToDuration{1};
return __t;
}
template <class _ToDuration, class _Rep, class _Period>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
typename enable_if
<
__is_duration<_ToDuration>::value,
_ToDuration
>::type
ceil(const duration<_Rep, _Period>& __d)
{
_ToDuration __t = duration_cast<_ToDuration>(__d);
if (__t < __d)
__t = __t + _ToDuration{1};
return __t;
}
template <class _ToDuration, class _Rep, class _Period>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
typename enable_if
<
__is_duration<_ToDuration>::value,
_ToDuration
>::type
round(const duration<_Rep, _Period>& __d)
{
_ToDuration __lower = floor<_ToDuration>(__d);
_ToDuration __upper = __lower + _ToDuration{1};
auto __lowerDiff = __d - __lower;
auto __upperDiff = __upper - __d;
if (__lowerDiff < __upperDiff)
return __lower;
if (__lowerDiff > __upperDiff)
return __upper;
return __lower.count() & 1 ? __upper : __lower;
}
#endif
// duration
template <class _Rep, class _Period>
@@ -807,6 +880,56 @@ time_point_cast(const time_point<_Clock, _Duration>& __t)
return time_point<_Clock, _ToDuration>(_VSTD::chrono::duration_cast<_ToDuration>(__t.time_since_epoch()));
}
#if _LIBCPP_STD_VER > 14
template <class _ToDuration, class _Clock, class _Duration>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
typename enable_if
<
__is_duration<_ToDuration>::value,
time_point<_Clock, _ToDuration>
>::type
floor(const time_point<_Clock, _Duration>& __t)
{
return time_point<_Clock, _ToDuration>{floor<_ToDuration>(__t.time_since_epoch())};
}
template <class _ToDuration, class _Clock, class _Duration>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
typename enable_if
<
__is_duration<_ToDuration>::value,
time_point<_Clock, _ToDuration>
>::type
ceil(const time_point<_Clock, _Duration>& __t)
{
return time_point<_Clock, _ToDuration>{ceil<_ToDuration>(__t.time_since_epoch())};
}
template <class _ToDuration, class _Clock, class _Duration>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
typename enable_if
<
__is_duration<_ToDuration>::value,
time_point<_Clock, _ToDuration>
>::type
round(const time_point<_Clock, _Duration>& __t)
{
return time_point<_Clock, _ToDuration>{round<_ToDuration>(__t.time_since_epoch())};
}
template <class _Rep, class _Period>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
typename enable_if
<
numeric_limits<_Rep>::is_signed,
duration<_Rep, _Period>
>::type
abs(duration<_Rep, _Period> __d)
{
return __d >= __d.zero() ? __d : -__d;
}
#endif
// time_point ==
template <class _Clock, class _Duration1, class _Duration2>