Improve API docs for <chrono> and <ratio>
* doc/doxygen/doxygroups.cc (std::literals): Add documentation for inline namespace. * include/std/chrono: Improve docs. * include/std/ratio: Do not document implementation details. * testsuite/20_util/ratio/cons/cons_overflow_neg.cc: Adjust dg-error line numbers. * testsuite/20_util/ratio/operations/ops_overflow_neg.cc: Likewise. From-SVN: r270988
This commit is contained in:
Jonathan Wakely
Jonathan Wakely
parent
f61a12b395
commit
c34d3fd306
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@ -1,5 +1,13 @@
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2019-05-07 Jonathan Wakely <jwakely@redhat.com>
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* doc/doxygen/doxygroups.cc (std::literals): Add documentation for
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inline namespace.
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* include/std/chrono: Improve docs.
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* include/std/ratio: Do not document implementation details.
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* testsuite/20_util/ratio/cons/cons_overflow_neg.cc: Adjust dg-error
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line numbers.
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* testsuite/20_util/ratio/operations/ops_overflow_neg.cc: Likewise.
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PR libstdc++/89102
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* doc/xml/manual/intro.xml: Document DR 2408 and 2465 changes.
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* include/std/chrono (__duration_common_type_wrapper): Replace with ...
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@ -19,6 +19,9 @@
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/** @namespace std
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* @brief ISO C++ entities toplevel namespace is std.
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*/
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/** @namespace std
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* @brief ISO C++ inline namespace for literal suffixes.
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*/
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/** @namespace std::__detail
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* @brief Implementation details not part of the namespace std interface.
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*/
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@ -24,6 +24,7 @@
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/** @file include/chrono
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* This is a Standard C++ Library header.
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* @ingroup chrono
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*/
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#ifndef _GLIBCXX_CHRONO
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@ -67,6 +68,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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// 20.11.4.3 specialization of common_type (for duration, sfinae-friendly)
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/// @cond undocumented
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template<typename _CT, typename _Period1, typename _Period2, typename = void>
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struct __duration_common_type
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{ };
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@ -90,6 +93,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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struct __duration_common_type<__failure_type, _Period1, _Period2>
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{ typedef __failure_type type; };
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/// @endcond
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/// Specialization of common_type for chrono::duration types.
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/// @relates duration
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template<typename _Rep1, typename _Period1, typename _Rep2, typename _Period2>
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struct common_type<chrono::duration<_Rep1, _Period1>,
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chrono::duration<_Rep2, _Period2>>
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@ -98,6 +105,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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// 20.11.4.3 specialization of common_type (for time_point, sfinae-friendly)
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/// @cond undocumented
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template<typename _CT, typename _Clock, typename = void>
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struct __timepoint_common_type
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{ };
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@ -108,14 +117,25 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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using type = chrono::time_point<_Clock, typename _CT::type>;
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};
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/// @endcond
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/// Specialization of common_type for chrono::time_point types.
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/// @relates time_point
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template<typename _Clock, typename _Duration1, typename _Duration2>
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struct common_type<chrono::time_point<_Clock, _Duration1>,
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chrono::time_point<_Clock, _Duration2>>
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: __timepoint_common_type<common_type<_Duration1, _Duration2>, _Clock>
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{ };
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// @} group chrono
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namespace chrono
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{
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/// @addtogroup chrono
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/// @{
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/// @cond undocumented
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// Primary template for duration_cast impl.
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template<typename _ToDur, typename _CF, typename _CR,
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bool _NumIsOne = false, bool _DenIsOne = false>
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@ -188,6 +208,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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using __disable_if_is_duration
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= typename enable_if<!__is_duration<_Tp>::value, _Tp>::type;
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/// @endcond
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/// duration_cast
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template<typename _ToDur, typename _Rep, typename _Period>
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constexpr __enable_if_is_duration<_ToDur>
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@ -288,6 +310,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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{ return numeric_limits<_Rep>::lowest(); }
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};
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/// @cond undocumented
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template<typename _Tp>
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struct __is_ratio
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: std::false_type
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@ -298,6 +322,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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: std::true_type
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{ };
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/// @endcond
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/// duration
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template<typename _Rep, typename _Period>
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struct duration
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@ -446,6 +472,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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rep __r;
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};
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/// @relates duration @{
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/// The sum of two durations.
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template<typename _Rep1, typename _Period1,
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typename _Rep2, typename _Period2>
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constexpr typename common_type<duration<_Rep1, _Period1>,
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@ -459,6 +488,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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return __cd(__cd(__lhs).count() + __cd(__rhs).count());
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}
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/// The difference between two durations.
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template<typename _Rep1, typename _Period1,
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typename _Rep2, typename _Period2>
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constexpr typename common_type<duration<_Rep1, _Period1>,
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@ -472,6 +502,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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return __cd(__cd(__lhs).count() - __cd(__rhs).count());
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}
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/// @}
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/// @cond undocumented
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// SFINAE helper to obtain common_type<_Rep1, _Rep2> only if _Rep2
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// is implicitly convertible to it.
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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@ -481,6 +515,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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using __common_rep_t = typename
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enable_if<is_convertible<const _Rep2&, _CRep>::value, _CRep>::type;
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/// @endcond
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/// @relates duration @{
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/// Multiply a duration by a scalar value.
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template<typename _Rep1, typename _Period, typename _Rep2>
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constexpr duration<__common_rep_t<_Rep1, _Rep2>, _Period>
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operator*(const duration<_Rep1, _Period>& __d, const _Rep2& __s)
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@ -490,6 +529,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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return __cd(__cd(__d).count() * __s);
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}
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/// Multiply a duration by a scalar value.
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template<typename _Rep1, typename _Rep2, typename _Period>
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constexpr duration<__common_rep_t<_Rep2, _Rep1>, _Period>
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operator*(const _Rep1& __s, const duration<_Rep2, _Period>& __d)
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@ -542,6 +582,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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}
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// comparisons
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template<typename _Rep1, typename _Period1,
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typename _Rep2, typename _Period2>
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constexpr bool
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@ -594,6 +635,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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const duration<_Rep2, _Period2>& __rhs)
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{ return !(__lhs < __rhs); }
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/// @}
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#ifdef _GLIBCXX_USE_C99_STDINT_TR1
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# define _GLIBCXX_CHRONO_INT64_T int64_t
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#elif defined __INT64_TYPE__
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}
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#endif // C++17
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/// @relates time_point @{
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/// Adjust a time point forwards by the given duration.
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template<typename _Clock, typename _Dur1,
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typename _Rep2, typename _Period2>
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constexpr time_point<_Clock,
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@ -734,6 +780,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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return __time_point(__lhs.time_since_epoch() + __rhs);
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}
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/// Adjust a time point forwards by the given duration.
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template<typename _Rep1, typename _Period1,
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typename _Clock, typename _Dur2>
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constexpr time_point<_Clock,
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@ -747,6 +794,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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return __time_point(__rhs.time_since_epoch() + __lhs);
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}
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/// Adjust a time point backwards by the given duration.
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template<typename _Clock, typename _Dur1,
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typename _Rep2, typename _Period2>
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constexpr time_point<_Clock,
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@ -760,6 +808,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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return __time_point(__lhs.time_since_epoch() -__rhs);
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}
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/// @}
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/// @relates time_point @{
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/// The difference between two time points (as a duration)
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template<typename _Clock, typename _Dur1, typename _Dur2>
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constexpr typename common_type<_Dur1, _Dur2>::type
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operator-(const time_point<_Clock, _Dur1>& __lhs,
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const time_point<_Clock, _Dur2>& __rhs)
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{ return !(__lhs < __rhs); }
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// @}
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// Clocks.
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@ -827,6 +881,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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* @brief System clock.
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*
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* Time returned represents wall time from the system-wide clock.
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* @ingroup chrono
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*/
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struct system_clock
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{
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* @brief Monotonic clock
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*
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* Time returned has the property of only increasing at a uniform rate.
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* @ingroup chrono
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*/
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struct steady_clock
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{
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* This is the clock "with the shortest tick period." Alias to
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* std::system_clock until higher-than-nanosecond definitions
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* become feasible.
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* @ingroup chrono
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*/
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using high_resolution_clock = system_clock;
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} // end inline namespace _V2
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// @}
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} // namespace chrono
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#if __cplusplus > 201103L
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@ -899,10 +957,34 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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inline namespace literals
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{
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/** ISO C++ 2014 namespace for suffixes for duration literals.
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*
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* These suffixes can be used to create `chrono::duration` values with
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* tick periods of hours, minutes, seconds, milliseconds, microseconds
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* or nanoseconds. For example, `std::chrono::seconds(5)` can be written
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* as `5s` after making the suffix visible in the current scope.
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* The suffixes can be made visible by a using-directive or
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* using-declaration such as:
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* - `using namespace std::chrono_literals;`
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* - `using namespace std::literals;`
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* - `using namespace std::chrono;`
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* - `using namespace std;`
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* - `using std::chrono_literals::operator""s;`
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*
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* The result of these suffixes on an integer literal is one of the
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* standard typedefs such as `std::chrono::hours`.
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* The result on a floating-point literal is a duration type with the
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* specified tick period and an unspecified floating-point representation,
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* for example `1.5e2ms` might be equivalent to
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* `chrono::duration<long double, chrono::milli>(1.5e2)`.
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*
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* @ingroup chrono
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*/
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inline namespace chrono_literals
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{
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wliteral-suffix"
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/// @cond undocumented
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template<typename _Dur, char... _Digits>
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constexpr _Dur __check_overflow()
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{
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@ -912,56 +994,69 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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"literal value cannot be represented by duration type");
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return _Dur(__repval);
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}
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/// @endcond
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/// Literal suffix for durations representing non-integer hours
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constexpr chrono::duration<long double, ratio<3600,1>>
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operator""h(long double __hours)
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{ return chrono::duration<long double, ratio<3600,1>>{__hours}; }
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/// Literal suffix for durations of type `std::chrono::hours`
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template <char... _Digits>
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constexpr chrono::hours
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operator""h()
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{ return __check_overflow<chrono::hours, _Digits...>(); }
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/// Literal suffix for durations representing non-integer minutes
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constexpr chrono::duration<long double, ratio<60,1>>
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operator""min(long double __mins)
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{ return chrono::duration<long double, ratio<60,1>>{__mins}; }
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/// Literal suffix for durations of type `std::chrono::minutes`
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template <char... _Digits>
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constexpr chrono::minutes
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operator""min()
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{ return __check_overflow<chrono::minutes, _Digits...>(); }
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/// Literal suffix for durations representing non-integer seconds
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constexpr chrono::duration<long double>
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operator""s(long double __secs)
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{ return chrono::duration<long double>{__secs}; }
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/// Literal suffix for durations of type `std::chrono::seconds`
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template <char... _Digits>
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constexpr chrono::seconds
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operator""s()
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{ return __check_overflow<chrono::seconds, _Digits...>(); }
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/// Literal suffix for durations representing non-integer milliseconds
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constexpr chrono::duration<long double, milli>
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operator""ms(long double __msecs)
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{ return chrono::duration<long double, milli>{__msecs}; }
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/// Literal suffix for durations of type `std::chrono::milliseconds`
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template <char... _Digits>
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constexpr chrono::milliseconds
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operator""ms()
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{ return __check_overflow<chrono::milliseconds, _Digits...>(); }
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/// Literal suffix for durations representing non-integer microseconds
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constexpr chrono::duration<long double, micro>
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operator""us(long double __usecs)
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{ return chrono::duration<long double, micro>{__usecs}; }
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/// Literal suffix for durations of type `std::chrono::microseconds`
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template <char... _Digits>
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constexpr chrono::microseconds
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operator""us()
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{ return __check_overflow<chrono::microseconds, _Digits...>(); }
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/// Literal suffix for durations representing non-integer nanoseconds
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constexpr chrono::duration<long double, nano>
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operator""ns(long double __nsecs)
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{ return chrono::duration<long double, nano>{__nsecs}; }
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/// Literal suffix for durations of type `std::chrono::nanoseconds`
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template <char... _Digits>
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constexpr chrono::nanoseconds
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operator""ns()
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@ -978,8 +1073,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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#endif // C++14
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// @} group chrono
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace std
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@ -24,6 +24,7 @@
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/** @file include/ratio
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* This is a Standard C++ Library header.
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* @ingroup ratio
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*/
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#ifndef _GLIBCXX_RATIO
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@ -50,6 +51,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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* @{
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*/
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/// @cond undocumented
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template<intmax_t _Pn>
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struct __static_sign
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: integral_constant<intmax_t, (_Pn < 0) ? -1 : 1>
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@ -243,6 +246,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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static_assert(__rem < __d, "Internal library error");
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};
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/// @endcond
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/**
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* @brief Provides compile-time rational arithmetic.
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*
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@ -280,6 +285,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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template<intmax_t _Num, intmax_t _Den>
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constexpr intmax_t ratio<_Num, _Den>::den;
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/// @cond undocumented
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template<typename _R1, typename _R2>
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struct __ratio_multiply
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{
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@ -306,10 +313,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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template<typename _R1, typename _R2>
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constexpr intmax_t __ratio_multiply<_R1, _R2>::den;
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/// @endcond
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/// ratio_multiply
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template<typename _R1, typename _R2>
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using ratio_multiply = typename __ratio_multiply<_R1, _R2>::type;
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/// @cond undocumented
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template<typename _R1, typename _R2>
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struct __ratio_divide
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{
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@ -329,6 +340,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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template<typename _R1, typename _R2>
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constexpr intmax_t __ratio_divide<_R1, _R2>::den;
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/// @endcond
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/// ratio_divide
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template<typename _R1, typename _R2>
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using ratio_divide = typename __ratio_divide<_R1, _R2>::type;
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@ -345,6 +358,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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: integral_constant<bool, !ratio_equal<_R1, _R2>::value>
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{ };
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/// @cond undocumented
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// Both numbers are positive.
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template<typename _R1, typename _R2,
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typename _Left = __big_mul<_R1::num,_R2::den>,
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@ -375,6 +390,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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ratio<-_R1::num, _R1::den> >::type
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{ };
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/// @endcond
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/// ratio_less
|
||||
template<typename _R1, typename _R2>
|
||||
struct ratio_less
|
||||
|
|
@ -416,6 +433,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
|
|||
= ratio_greater_equal<_R1, _R2>::value;
|
||||
#endif // C++17
|
||||
|
||||
/// @cond undocumented
|
||||
|
||||
template<typename _R1, typename _R2,
|
||||
bool = (_R1::num >= 0),
|
||||
bool = (_R2::num >= 0),
|
||||
|
|
@ -499,10 +518,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
|
|||
template<typename _R1, typename _R2>
|
||||
constexpr intmax_t __ratio_add<_R1, _R2>::den;
|
||||
|
||||
/// @endcond
|
||||
|
||||
/// ratio_add
|
||||
template<typename _R1, typename _R2>
|
||||
using ratio_add = typename __ratio_add<_R1, _R2>::type;
|
||||
|
||||
/// @cond undocumented
|
||||
|
||||
template<typename _R1, typename _R2>
|
||||
struct __ratio_subtract
|
||||
{
|
||||
|
|
@ -520,6 +543,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
|
|||
template<typename _R1, typename _R2>
|
||||
constexpr intmax_t __ratio_subtract<_R1, _R2>::den;
|
||||
|
||||
/// @endcond
|
||||
|
||||
/// ratio_subtract
|
||||
template<typename _R1, typename _R2>
|
||||
using ratio_subtract = typename __ratio_subtract<_R1, _R2>::type;
|
||||
|
|
|
|||
|
|
@ -45,7 +45,7 @@ test04()
|
|||
std::ratio<1,0> r1 __attribute__((unused)); // { dg-error "required from here" }
|
||||
}
|
||||
|
||||
// { dg-error "denominator cannot be zero" "" { target *-*-* } 263 }
|
||||
// { dg-error "out of range" "" { target *-*-* } 264 }
|
||||
// { dg-error "overflow in constant expression" "" { target *-*-* } 59 }
|
||||
// { dg-error "denominator cannot be zero" "" { target *-*-* } 0 }
|
||||
// { dg-error "out of range" "" { target *-*-* } 0 }
|
||||
// { dg-error "overflow in constant expression" "" { target *-*-* } 0 }
|
||||
// { dg-prune-output "not a member" }
|
||||
|
|
|
|||
|
|
@ -41,10 +41,10 @@ test02()
|
|||
// { dg-error "required from here" "" { target *-*-* } 28 }
|
||||
// { dg-error "expected initializer" "" { target *-*-* } 35 }
|
||||
// { dg-error "expected initializer" "" { target *-*-* } 37 }
|
||||
// { dg-error "overflow in addition" "" { target *-*-* } 450 }
|
||||
// { dg-error "overflow in multiplication" "" { target *-*-* } 95 }
|
||||
// { dg-error "overflow in multiplication" "" { target *-*-* } 97 }
|
||||
// { dg-error "overflow in multiplication" "" { target *-*-* } 99 }
|
||||
// { dg-error "overflow in constant expression" "" { target *-*-* } 106 }
|
||||
// { dg-error "overflow in addition" "" { target *-*-* } 0 }
|
||||
// { dg-error "overflow in multiplication" "" { target *-*-* } 98 }
|
||||
// { dg-error "overflow in multiplication" "" { target *-*-* } 100 }
|
||||
// { dg-error "overflow in multiplication" "" { target *-*-* } 102 }
|
||||
// { dg-error "overflow in constant expression" "" { target *-*-* } 0 }
|
||||
// { dg-prune-output "out of range" }
|
||||
// { dg-prune-output "not usable in a constant expression" }
|
||||
|
|
|
|||
Loading…
Reference in New Issue