Linux Manuals session 3

std::chrono::current_zone – std::chrono::current_zone Synopsis Defined in header <chrono> const std::chrono::time_zone* current_zone(); (since C++20) Convenience function for obtaining local time zone from the time zone database. Equivalent to std::chrono::get_tzdb().current_zone(). Exceptions std::runtime_error if this is the first reference to the time zone database and the time zone database cannot be initialized. Notes A call to this function…

std::chrono::clock_time_conversion – std::chrono::clock_time_conversion Synopsis Defined in header <chrono> template<class Dest, class Source> struct clock_time_conversion { }; (since C++20) std::chrono::clock_time_conversion is a trait that specifies how to convert a std::chrono::time_point of the Source clock to that of the Dest clock. It does so by providing an const-callable operator() that accepts an argument of type std::chrono::time_point<Source, Duration>…

std::chrono::clock_cast – std::chrono::clock_cast Synopsis Defined in header<chrono> template <class Dest, class Source, class Duration> (since C++ 20) auto clock_cast(const std::chrono::time_point<Source, Duration> &t); Converts the time point t of a clock Source to an equivalent time point of the clock Dest, using std::chrono::system_clock and/or std::chrono::utc_clock as intermediaries if necessary. * If the expression std::chrono::clock_time_conversion<Dest, Source>{}(t) is…

std::chrono::choose – std::chrono::choose Synopsis Defined in header <chrono> enum class choose { earliest, (since C++20) latest }; The scoped enumeration choose can be passed to certain member functions of std::chrono::time_zone and std::chrono::zoned_time to control how ambiguous or nonexistent local times should be resolved. Passing choose::earliest causes the earlier time point to be returned, while passing…

std::chrono::ceil(std::chrono::time_point) – std::chrono::ceil(std::chrono::time_point) Synopsis Defined in header<chrono> template <class ToDuration, class Clock, class Duration> (since C++ 17) constexpr time_point<Clock, ToDuration> ceil(const time_point<Clock, Duration> &tp); Returns the smallest time point t representable in ToDuration that is greater or equal to tp. The function does not participate in the overload resolution unless ToDuration is an instance of…

std::chrono::ceil(std::chrono::duration) – std::chrono::ceil(std::chrono::duration) Synopsis Defined in header<chrono> template <class ToDuration, class Rep, class Period> (since C++ 17) constexpr ToDuration ceil(const duration<Rep, Period> &d); Returns the smallest duration t representable in ToDuration that is greater or equal to d. The function does not participate in the overload resolution unless ToDuration is an instance of std::chrono::duration. Parameters…

std::chrono::ambiguous_local_time – std::chrono::ambiguous_local_time Synopsis Defined in header <chrono> class ambiguous_local_time; (since C++20) Defines a type of object to be thrown as exception to report that an attempt was made to convert a ambiguous std::chrono::local_time to a std::chrono::sys_time without specifying a std::chrono::choose (such as choose::earliest or choose::latest). This exception is thrown by std::chrono::time_zone::to_sys and functions that…

std::chrono::abs(std::chrono::duration) – std::chrono::abs(std::chrono::duration) Synopsis Defined in header <chrono> template <class Rep, class Period> (since C++17) constexpr duration<Rep, Period> abs(duration<Rep, Period> d) Returns the absolute value of the duration d. Specifically, if d >= d.zero(), return d, otherwise return -d. The function does not participate in the overload resolution unless std::numeric_limits<Rep>::is_signed is true. Parameters d –…

std::chrono::_V2::system_clock – Synopsis Public Types typedef chrono::nanoseconds duration typedef duration::period period typedef duration::rep rep typedef chrono::time_point < system_clock, duration > time_point" Public Member Functions < system_clock::duration::zero(),’aclock’sminimumdurationcannotbelessthanitsepoch’);staticconstexprboolis_steady=false;statictime_pointnow() noexcept;staticstd::time_tto_time_t(consttime_point &__t) noexcept{returnstd::time_t(duration_cast < chrono::seconds > __t time_since_epoch ()).count())" Static Public Member Functions static time_point from_time_t (std::time_t __t) noexcept Detailed Description System clock. Time returned represents wall time from…

std::chrono::_V2::steady_clock – Synopsis Public Types typedef chrono::nanoseconds duration typedef duration::period period typedef duration::rep rep typedef chrono::time_point < steady_clock, duration > time_point" Static Public Member Functions static time_point now () noexcept Static Public Attributes static constexpr bool is_steady Detailed Description Monotonic clock. Time returned has the property of only increasing at a uniform rate. Definition at…

std::chrono – Synopsis Classes struct duration struct duration_values struct time_point struct treat_as_floating_point Typedefs typedef duration< int, ratio< 3600 > > hours typedef duration< int64_t, micro > microseconds typedef duration< int64_t, milli > milliseconds typedef duration< int, ratio< 60 > > minutes typedef duration< int64_t, nano > nanoseconds typedef duration< int64_t > seconds Functions template<typename _ToDur…

std::chi_squared_distribution< _RealType >::param_type – Synopsis Public Types typedef chi_squared_distribution < _RealType > distribution_type" Public Attributes __pad0__ : _M_n(__n) { } _RealType n() const { return _M_n Friends bool operator==(const param_type &__p1, const param_type &__p2) Detailed Description template<typename _RealType = double>struct std::chi_squared_distribution< _RealType >::param_type Parameter type. Definition at line 2728 of file random.h. Author Generated automatically…

std::chi_squared_distribution<RealType>::reset – std::chi_squared_distribution<RealType>::reset Synopsis void reset(); (since C++ 11) Resets the internal state of the distribution object. After a call to this function, the next call to operator() on the distribution object will not be dependent on previous calls to operator(). Parameters (none) Return value (none) Complexity Constant.

std::chi_squared_distribution<RealType>::param – std::chi_squared_distribution<RealType>::param Synopsis param_type param() const; (1) (since C++11) void param( const param_type& params ); (2) (since C++11) Manages the associated distribution parameter set. 1) Returns the associated parameter set. 2) Sets the associated parameter set to params Parameters params – new contents of the associated parameter set Return value 1) The associated parameter…

std::chi_squared_distribution<RealType>::operator() – std::chi_squared_distribution<RealType>::operator() Synopsis template <class Generator> (1)(since C++ 11) result_type operator()(Generator &g); template <class Generator> (2)(since C++ 11) result_type operator()(Generator &g, const param_type &params); Generates random numbers that are distributed according to the associated probability function. The entropy is acquired by calling g.operator(). The first version uses the associated parameter set, the second version…

std::chi_squared_distribution<RealType>::n – std::chi_squared_distribution<RealType>::n Synopsis RealType n() const; (since C++11) Returns the n parameter the distribution was constructed with. It specifies the degrees_of_freedom of the distribution. The default value is 1.0. Parameters (none) Return value The n distribution parameter. See also       gets or sets the distribution parameter object param (public member function)

std::chi_squared_distribution<RealType>::min – std::chi_squared_distribution<RealType>::min Synopsis result_type min() const; (since C++11) Returns the minimum value potentially generated by the distribution. Parameters (none) Return value The minimum value potentially generated by the distribution Complexity Constant. See also     returns the maximum potentially generated value max (public member function)

std::chi_squared_distribution<RealType>::max – std::chi_squared_distribution<RealType>::max Synopsis result_type max() const; (since C++11) Returns the maximum value potentially generated by the distribution. Parameters (none) Return value The maximum value potentially generated by the distribution. Complexity Constant. See also     returns the minimum potentially generated value min (public member function)

std::chi_squared_distribution<RealType>::chi_squared_distribution – std::chi_squared_distribution<RealType>::chi_squared_distribution Synopsis chi_squared_distribution() : chi_squared_distribution(1.0) {} (1) (since C++11) explicit chi_squared_distribution( RealType n ); (2) (since C++11) explicit chi_squared_distribution( const param_type& params ); (3) (since C++11) Constructs a new distribution object. (2) uses n as the distribution parameter. (3) uses params as the distribution parameter. Parameters n – the n distribution parameter (degrees…

std::chi_squared_distribution – std::chi_squared_distribution Synopsis Defined in header <random> template< class RealType = double > (since C++11) class chi_squared_distribution; The chi_squared_distribution produces random numbers x>0 according to the Chi-squared_distribution:       f(x;n) =       x(n/2)-1       e-x/2       Γ(n/2) 2n/2 Γ is the Gamma_function (See also std::tgamma) and n are the degrees_of_freedom (default 1). std::chi_squared_distribution satisfies all requirements of RandomNumberDistribution Template…