Linux Manuals session 3

std::chrono::from_stream(std::chrono::day) – std::chrono::from_stream(std::chrono::day) Synopsis template <class CharT, class Traits, class Alloc = std::allocator<CharT>> std::basic_istream<CharT, Traits> & from_stream(std::basic_istream<CharT, Traits> &is, const CharT *fmt, (since C++ 20) std::chrono::day &d, std::basic_string<CharT, Traits, Alloc> *abbrev = nullptr, std::chrono::minutes *offset = nullptr); Attempts to parse the input stream is into the std::chrono::day d according to the format string fmt. Behaves…

std::chrono::format – std::chrono::format Synopsis template <class CharT, class Streamable> (1)(since C++ 20) std::basic_string<CharT> format(const CharT *fmt, const Streamable &s); template <class CharT, class Streamable> (2)(since C++ 20) std::basic_string<CharT> format(const std::locale &loc, const CharT *fmt, const Streamable &s); template <class CharT, class Traits, class Alloc, class Streamable> std::basic_string<CharT, Traits, Alloc> format(const std::basic_string<CharT, Traits, Alloc> &fmt, (3)(since…

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

std::chrono::floor(std::chrono::duration) – std::chrono::floor(std::chrono::duration) Synopsis Defined in header<chrono> template <class ToDuration, class Rep, class Period> (since C++ 17) constexpr ToDuration floor(const duration<Rep, Period> &d); Returns the greatest duration t representable in ToDuration that is less 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::file_clock::to_utc,std::chrono::file_clock::from_utc – std::chrono::file_clock::to_utc,std::chrono::file_clock::from_utc Synopsis template <class Duration> (since C++ 20) static std::chrono::utc_time</*see below*/>(1)(optional) to_utc(const std::chrono::file_time<Duration> &t); template <class Duration> (since C++ 20) static std::chrono::file_time</*see below*/>(2)(optional) from_utc(const std::chrono::utc_time<Duration> &t); 1) Converts the file_time t to a utc_time representing the same point in time. 2) Converts the utc_time t to a file_time representing the same point in…

std::chrono::file_clock::to_sys,std::chrono::file_clock::from_sys – std::chrono::file_clock::to_sys,std::chrono::file_clock::from_sys Synopsis template <class Duration> (since C++ 20) static std::chrono::sys_time</*see below*/>(1)(optional) to_sys(const std::chrono::file_time<Duration> &t); template <class Duration> (since C++ 20) static std::chrono::file_time</*see below*/>(2)(optional) from_sys(const std::chrono::sys_time<Duration> &t); 1) Converts the file_time t to a sys_time representing the same point in time. 2) Converts the sys_time t to a file_time representing the same point in…

std::chrono::file_clock::now – std::chrono::file_clock::now Synopsis static std::chrono::time_point<std::chrono::file_clock> now() noexcept; (since C++20) Returns a time point representing the current point in time. Parameters (none) Return value A time point representing the current time. Example // Run this code #include <iostream> #include <vector> #include <numeric> #include <chrono> volatile int sink; int main() { for (auto size = 1ull;…

std::chrono::file_clock – std::chrono::file_clock Synopsis Defined in header <chrono> using file_clock = /* see below */; (since C++20) std::chrono::file_clock is an alias for the clock used for std::filesystem::file_time_type. Its epoch is unspecified. file_clock meets the TrivialClock requirements. Time point family Defined in namespace std::chrono template<class Duration> (since C++20) using file_time = std::chrono::time_point<std::chrono::file_clock, Duration>; operator<<_(std::chrono::file_time) performs stream…

std::chrono::duration_values<Rep>::zero – std::chrono::duration_values<Rep>::zero Synopsis static constexpr Rep zero(); (until C++20) static constexpr Rep zero() noexcept; (since C++20) Returns a zero-length representation. Parameters (none) Return value returns Rep(0) See also zero returns the special duration value zero          (public static member function of std::chrono::duration<Rep,Period>) [static] min returns the smallest possible representation          (public static member function) [static] max…

std::chrono::duration_values<Rep>::min – std::chrono::duration_values<Rep>::min Synopsis static constexpr Rep min(); (until C++20) static constexpr Rep min() noexcept; (since C++20) Returns the lowest possible representation. Parameters (none) Return value returns std::numeric_limits<Rep>::lowest() See also min returns the special duration value min          (public static member function of std::chrono::duration<Rep,Period>) [static] zero returns a zero-length representation          (public static member function) [static] max…

std::chrono::duration_values<Rep>::max – std::chrono::duration_values<Rep>::max Synopsis static constexpr Rep max(); (until C++20) static constexpr Rep max() noexcept; (since C++20) Returns the largest possible representation. Parameters (none) Return value returns std::numeric_limits<Rep>::max() See also max returns the special duration value max          (public static member function of std::chrono::duration<Rep,Period>) [static] zero returns a zero-length representation          (public static member function) [static] min…

std::chrono::duration_values – std::chrono::duration_values Synopsis Defined in header<chrono> template <class Rep> (since C++ 11) struct duration_values; The std::chrono::duration_values type defines three common durations: * std::chrono::duration_values::zero * std::chrono::duration_values::min * std::chrono::duration_values::max The zero, min, and max methods in std::chrono::duration forward their work to these methods. This type can be specialized if the representation Rep requires a specific implementation…

std::chrono::duration_cast – std::chrono::duration_cast Synopsis template <class ToDuration, class Rep, class Period> (since C++ 11) constexpr ToDuration duration_cast(const duration<Rep, Period> &d); Converts a std::chrono::duration to a duration of different type ToDuration. No implicit conversions are used. Multiplications and divisions are avoided where possible, if it is known at compile time that one or more parameters are…

std::chrono::duration<Rep,Period>::zero – std::chrono::duration<Rep,Period>::zero Synopsis static constexpr duration zero(); (until C++20) static constexpr duration zero() noexcept; (since C++20) Returns a zero-length duration. If the representation rep of the duration requires some other implementation to return a zero-length duration, std::chrono::duration_values can be specialized to return the desired value. Parameters (none) Return value returns duration(std::chrono::duration_values<rep>::zero()) See also min…

std::chrono::day::operatorunsigned – std::chrono::day::operatorunsigned Synopsis explicit constexpr operator unsigned() const noexcept; (since C++20) Returns the day value stored in *this. Return value The day value stored in *this.

std::chrono::day::operator+=,std::chrono::day::operator-= – std::chrono::day::operator+=,std::chrono::day::operator-= Synopsis constexpr std::chrono::day &operator+=(const std::chrono::days &d) noexcept; (1)(since C++ 20) constexpr std::chrono::day & operator-=(const std::chrono::days &d) noexcept; (2) (since C++20) Adds or subtracts d.count() days from the day value. 1) Equivalent to *this = *this + d; 2) Equivalent to *this = *this – d; Return value A reference to this day…

std::chrono::day::operator++,std::chrono::day::operator– – std::chrono::day::operator++,std::chrono::day::operator– Synopsis constexpr std::chrono::day& operator++() noexcept; (1) (since C++20) constexpr std::chrono::day operator++(int) noexcept; (2) (since C++20) constexpr std::chrono::day& operator–() noexcept; (3) (since C++20) constexpr std::chrono::day operator–(int) noexcept; (4) (since C++20) Adds or subtracts 1 from the day value. 1-2) Performs *this += std::chrono::days{1}; 3-4) Performs *this -= std::chrono::days{1}; Parameters (none) Return value 1,3)…

std::chrono::day::ok – std::chrono::day::ok Synopsis constexpr bool ok() const noexcept; (since C++20) Checks if the day value stored in *this is in the valid range, i.e., [1, 31]. Return value true if the day value stored in *this is in the range [1, 31]. Otherwise false.

std::chrono::day::day – std::chrono::day::day Synopsis day() = default; (1) (since C++20) explicit constexpr day(unsigned d) noexcept; (2) (since C++20) Constructs a day object. 1) Default constructor leaves the day value uninitialized. 2) If d <= 255, constructs a day object holding the day value d. Otherwise the value held is unspecified.

std::chrono::day – std::chrono::day Synopsis Defined in header <chrono> class day; (since C++20) The class day represents a day in a month. Its normal range is [1, 31], but it may hold any number in [0, 255]. day is a TriviallyCopyable StandardLayoutType. Member functions                   constructs a day constructor (public member function) operator++ increments or decrements the…