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chrono

此标头是日期和时间图书馆。

班

在命名空间std：：timeo中定义

*。

持续时间%28C++11%29 a时间间隔%28类模板%29

系统[医]时钟%28C++11%29来自系统范围内的实时时钟%28class%29

稳住[医]永远不会调整的时钟%28C++11%29

高[医]分辨力[医]时钟%28C++11%29具有最短的刻度周期的时钟%28C++11%29

时间[医]时间点%28C++11%29 a点%28类模板%29

治疗[医]如[医]浮[医]点表示一个持续时间可以转换为具有不同刻度周期%28类模板%29的持续时间。

持续时间[医]值构造给定类型%28类模板%29的滴答计数的零值、最小值和最大值。

方便型

在命名空间std：：timeo中定义

Std：：Time：：纳秒持续时间类型与周期STD：：Nano

Std：：Time：：微秒持续时间类型与周期std：：microte

Std：：timeo：：毫秒持续时间类型与周期std：：Milli

Std：：Time：：秒持续时间类型与时间段STD：：比率<1>

Std：：Crono：：分钟持续时间类型与期间STD：：比率<60>

时间：：小时持续时间类型与期间std：：比率<3600>

专门性

在命名空间std中定义

性病：普通[医]类型<std：：crono：：time>专门化std：：public[医]类型特征%28类模板专门化%29

性病：普通[医]类型<std：：time：：time[医]点>专门研究性病：：公共[医]类型特征%28类模板专门化%29

功能

持续时间

*。

在命名空间std：：timeo中定义

运算符+运算符%2A运算符/运算符%实现算术操作，使用持续时间作为参数%28函数模板%29

运算符==运算符%21=运算符<运算符<=运算符>>=比较两个持续时间%28函数模板%29

持续时间[医]强制转换将一个持续时间转换为另一个持续时间，使用不同的刻度间隔%28功能模板%29。

地板%28 std：：time：：工期%29%28C++17%29将持续时间转换为另一个持续时间，舍入%28功能模板%29

Ceil%28std：：timeo：：工期%29%28C++17%29将持续时间转换为另一个持续时间，舍入%28功能模板%29

圆周%28 std：：time：：工期%29%28C++17%29将持续时间转换为另一个持续时间，舍入到最近，与偶数%28函数模板%29相关联

ABS%28 std：：time：：工期%29%28C++17%29获得持续时间%28功能模板%29的绝对值

时间点

在命名空间std：：timeo中定义

操作符+操作符-用给定的持续时间%28函数模板%29修改时间点

运算符==运算符%21=运算符<运算符<=运算符>>=比较两个时点%28函数模板%29

时间[医]点[医]CAST将时间点转换为同一时钟上的另一个时间点，具有不同的持续时间%28功能模板%29。

地板%28天：：时间：：时间[医]点%29%28C++17%29转换一次[医]指向另一个，舍入%28函数模板%29

Ceil%28 std：：Time：：Time[医]点%29%28C++17%29转换一次[医]指向另一个，将%28函数模板%29舍入

第28轮：：时间：：时间[医]点%29%28C++17%29转换一次[医]指向另一个，四舍五入至最近，与偶数%28函数模板%29相关联

文字

定义在内联命名空间std：：文本：：chrono中[医]文字

操作符“h%28C++14%29

操作符“min”%28C++14%29

运算符“s%28C++14%29

操作符ms%28C++14%29

操作符“”US%28C++14%29

运算符ns%28C++14%29

简介

二次

代码语言：javascript
复制
namespace std {
  namespace chrono {
    // class template duration
    template <class Rep, class Period = ratio<1>> class duration;
    // class template time_point
    template <class Clock, class Duration = typename Clock::duration> class time_point;
  }
  // common_type specializations
  template <class Rep1, class Period1, class Rep2, class Period2>
  struct common_type<chrono::duration<Rep1, Period1>,
                     chrono::duration<Rep2, Period2>>;
  template <class Clock, class Duration1, class Duration2>
  struct common_type<chrono::time_point<Clock, Duration1>,
                     chrono::time_point<Clock, Duration2>>;
  namespace chrono {
    // customization traits
    template <class Rep> struct treat_as_floating_point;
    template <class Rep> struct duration_values;
    template <class Rep>
    constexpr bool treat_as_floating_point_v = treat_as_floating_point<Rep>::value;
    // duration arithmetic
    template <class Rep1, class Period1, class Rep2, class Period2>
    common_type_t<duration<Rep1, Period1>, duration<Rep2, Period2>>
    constexpr operator+(const duration<Rep1, Period1>& lhs,
                        const duration<Rep2, Period2>& rhs);
    template <class Rep1, class Period1, class Rep2, class Period2>
    common_type_t<duration<Rep1, Period1>, duration<Rep2, Period2>>
    constexpr operator-(const duration<Rep1, Period1>& lhs,
                        const duration<Rep2, Period2>& rhs);
    template <class Rep1, class Period, class Rep2>
    duration<common_type_t<Rep1, Rep2>, Period>
    constexpr operator*(const duration<Rep1, Period>& d,
                        const Rep2& s);
    template <class Rep1, class Rep2, class Period>
    duration<common_type_t<Rep1, Rep2>, Period>
    constexpr operator*(const Rep1& s,
                        const duration<Rep2, Period>& d);
    template <class Rep1, class Period, class Rep2>
    duration<common_type_t<Rep1, Rep2>, Period>
    constexpr operator/(const duration<Rep1, Period>& d,
                        const Rep2& s);
    template <class Rep1, class Period1, class Rep2, class Period2>
    common_type_t<Rep1, Rep2>
    constexpr operator/(const duration<Rep1, Period1>& lhs,
                        const duration<Rep2, Period2>& rhs);
    template <class Rep1, class Period, class Rep2>
    duration<common_type_t<Rep1, Rep2>, Period>
    constexpr operator%(const duration<Rep1, Period>& d,
                        const Rep2& s);
    template <class Rep1, class Period1, class Rep2, class Period2>
    common_type_t<duration<Rep1, Period1>, duration<Rep2, Period2>>
    constexpr operator%(const duration<Rep1, Period1>& lhs,
                        const duration<Rep2, Period2>& rhs);
    // duration comparisons
    template <class Rep1, class Period1, class Rep2, class Period2>
    constexpr bool operator==(const duration<Rep1, Period1>& lhs,
                              const duration<Rep2, Period2>& rhs);
    template <class Rep1, class Period1, class Rep2, class Period2>
    constexpr bool operator!=(const duration<Rep1, Period1>& lhs,
                              const duration<Rep2, Period2>& rhs);
    template <class Rep1, class Period1, class Rep2, class Period2>
    constexpr bool operator< (const duration<Rep1, Period1>& lhs,
                              const duration<Rep2, Period2>& rhs);
    template <class Rep1, class Period1, class Rep2, class Period2>
    constexpr bool operator<=(const duration<Rep1, Period1>& lhs,
                              const duration<Rep2, Period2>& rhs);
    template <class Rep1, class Period1, class Rep2, class Period2>
    constexpr bool operator> (const duration<Rep1, Period1>& lhs,
                              const duration<Rep2, Period2>& rhs);
    template <class Rep1, class Period1, class Rep2, class Period2>
    constexpr bool operator>=(const duration<Rep1, Period1>& lhs,
                              const duration<Rep2, Period2>& rhs);
    // duration_cast
    template <class ToDuration, class Rep, class Period>
    constexpr ToDuration duration_cast(const duration<Rep, Period>& d);
    template <class ToDuration, class Rep, class Period>
    constexpr ToDuration floor(const duration<Rep, Period>& d);
    template <class ToDuration, class Rep, class Period>
    constexpr ToDuration ceil(const duration<Rep, Period>& d);
    template <class ToDuration, class Rep, class Period>
    constexpr ToDuration round(const duration<Rep, Period>& d);
    // convenience typedefs
    using nanoseconds = duration</*signed integer type of at least 64 bits*/ , nano>;
    using microseconds = duration</*signed integer type of at least 55 bits*/ , micro>;
    using milliseconds = duration</*signed integer type of at least 45 bits*/ , milli>;
    using seconds = duration</*signed integer type of at least 35 bits*/ >;
    using minutes = duration</*signed integer type of at least 29 bits*/ , ratio< 60>>;
    using hours = duration</*signed integer type of at least 23 bits*/ , ratio<3600>>;
    // time_point arithmetic
    template <class Clock, class Duration1, class Rep2, class Period2>
    constexpr time_point<Clock, common_type_t<Duration1, duration<Rep2, Period2>>>
    operator+(const time_point<Clock, Duration1>& lhs,
              const duration<Rep2, Period2>& rhs);
    template <class Rep1, class Period1, class Clock, class Duration2>
    constexpr time_point<Clock, common_type_t<duration<Rep1, Period1>, Duration2>>
    operator+(const duration<Rep1, Period1>& lhs,
              const time_point<Clock, Duration2>& rhs);
    template <class Clock, class Duration1, class Rep2, class Period2>
    constexpr time_point<Clock, common_type_t<Duration1, duration<Rep2, Period2>>>
    operator-(const time_point<Clock, Duration1>& lhs,
              const duration<Rep2, Period2>& rhs);
    template <class Clock, class Duration1, class Duration2>
    constexpr common_type_t<Duration1, Duration2>
    operator-(const time_point<Clock, Duration1>& lhs,
              const time_point<Clock, Duration2>& rhs);
    // time_point comparisons
    template <class Clock, class Duration1, class Duration2>
    constexpr bool operator==(const time_point<Clock, Duration1>& lhs,
                              const time_point<Clock, Duration2>& rhs);
    template <class Clock, class Duration1, class Duration2>
    constexpr bool operator!=(const time_point<Clock, Duration1>& lhs,
                              const time_point<Clock, Duration2>& rhs);
    template <class Clock, class Duration1, class Duration2>
    constexpr bool operator< (const time_point<Clock, Duration1>& lhs,
                              const time_point<Clock, Duration2>& rhs);
    template <class Clock, class Duration1, class Duration2>
    constexpr bool operator<=(const time_point<Clock, Duration1>& lhs,
                              const time_point<Clock, Duration2>& rhs);
    template <class Clock, class Duration1, class Duration2>
    constexpr bool operator> (const time_point<Clock, Duration1>& lhs,
                              const time_point<Clock, Duration2>& rhs);
    template <class Clock, class Duration1, class Duration2>
    constexpr bool operator>=(const time_point<Clock, Duration1>& lhs,
                              const time_point<Clock, Duration2>& rhs);
    // time_point_cast
    template <class ToDuration, class Clock, class Duration>
    constexpr 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);
    template <class ToDuration, class Clock, class Duration>
    constexpr time_point<Clock, ToDuration>
    ceil(const time_point<Clock, Duration>& tp);
    template <class ToDuration, class Clock, class Duration>
    constexpr time_point<Clock, ToDuration>
    round(const time_point<Clock, Duration>& tp);
    // specialized algorithms
    template <class Rep, class Period>
    constexpr duration<Rep, Period> abs(duration<Rep, Period> d);
    // clocks
    class system_clock;
    class steady_clock;
    class high_resolution_clock;
  }
  inline namespace literals {
    inline namespace chrono_literals {
      // suffixes for duration literals
      constexpr chrono::hours operator "" h(unsigned long long);
      constexpr chrono::duration</*unspecified*/,
                                 ratio<3600,1>> operator "" h(long double);
      constexpr chrono::minutes operator "" min(unsigned long long);
      constexpr chrono::duration</*unspecified*/,
                                 ratio<60,1>> operator "" min(long double);
      constexpr chrono::seconds operator "" s(unsigned long long);
      constexpr chrono::duration</*unspecified*/ > operator "" s(long double);
      constexpr chrono::milliseconds operator "" ms(unsigned long long);
      constexpr chrono::duration</*unspecified*/,
                                 milli> operator "" ms(long double);
      constexpr chrono::microseconds operator "" us(unsigned long long);
      constexpr chrono::duration</*unspecified*/,
                                 micro> operator "" us(long double);
      constexpr chrono::nanoseconds operator "" ns(unsigned long long);
      constexpr chrono::duration</*unspecified*/, 
                                 nano> operator "" ns(long double);
    }
  }
  namespace chrono {
    using namespace literals::chrono_literals;
  }

二次

std::chrono::treat_as_floating_point

二次

代码语言：javascript
复制
template <class Rep> struct treat_as_floating_point : is_floating_point<Rep> { };

二次

std::chrono::duration_values

二次

代码语言：javascript
复制
template <class Rep>
struct duration_values {
public:
  static constexpr Rep zero();
  static constexpr Rep min();
  static constexpr Rep max();
};

二次

std::chrono::duration

二次

代码语言：javascript
复制
template <class Rep, class Period = ratio<1>>
class duration {
public:
  using rep = Rep;
  using period = Period;
private:
  rep rep_; // exposition only
public:
  // construct/copy/destroy
  constexpr duration() = default;
  template <class Rep2>
  constexpr explicit duration(const Rep2& r);
  template <class Rep2, class Period2>
  constexpr duration(const duration<Rep2, Period2>& d);
  ~duration() = default;
  duration(const duration&) = default;
  duration& operator=(const duration&) = default;
  // observer
  constexpr rep count() const;
  // arithmetic
  constexpr duration operator+() const;
  constexpr duration operator-() const;
  constexpr duration& operator++();
  constexpr duration operator++(int);
  constexpr duration& operator--();
  constexpr duration operator--(int);
  constexpr duration& operator+=(const duration& d);
  constexpr duration& operator-=(const duration& d);
  constexpr duration& operator*=(const rep& rhs);
  constexpr duration& operator/=(const rep& rhs);
  constexpr duration& operator%=(const rep& rhs);
  constexpr duration& operator%=(const duration& rhs);
  // special values
  static constexpr duration zero();
  static constexpr duration min();
  static constexpr duration max();
};

二次

std::chrono::time_point

二次

代码语言：javascript
复制
template <class Clock, class Duration = typename Clock::duration>
class time_point {
public:
  using clock = Clock;
  using duration = Duration;
  using rep = typename duration::rep;
  using period = typename duration::period;
private:
  duration d_; // exposition only
public:
  // construct
  constexpr time_point(); // has value epoch
  constexpr explicit time_point(const duration& d); // same as time_point() + d
  template <class Duration2>
  constexpr time_point(const time_point<clock, Duration2>& t);
  // observer
  constexpr duration time_since_epoch() const;
  // arithmetic
  constexpr time_point& operator+=(const duration& d);
  constexpr time_point& operator-=(const duration& d);
  // special values
  static constexpr time_point min();
  static constexpr time_point max();
};

二次

std::chrono::system_clock

二次

代码语言：javascript
复制
class system_clock {
public:
  using rep = /*see description*/ ;
  using period = ratio</*unspecified*/, /*unspecified*/ >;
  using duration = chrono::duration<rep, period>;
  using time_point = chrono::time_point<system_clock>;
  static constexpr bool is_steady = /*unspecified*/ ;
  static time_point now() noexcept;
  // Map to C API
  static time_t to_time_t (const time_point& t) noexcept;
  static time_point from_time_t(time_t t) noexcept;
};

二次

std::chrono::steady_clock

二次

代码语言：javascript
复制
class steady_clock {
public:
  using rep = /*unspecified*/ ;
  using period = ratio</*unspecified*/, /*unspecified*/ >;
  using duration = chrono::duration<rep, period>;
  using time_point = chrono::time_point</*unspecified*/, duration>;
  static constexpr bool is_steady = true;
  static time_point now() noexcept;
};

二次

std::chrono::high_resolution_clock

二次

代码语言：javascript
复制
class high_resolution_clock {
public:
  using rep = /*unspecified*/ ;
  using period = ratio</*unspecified*/, /*unspecified*/ >;
  using duration = chrono::duration<rep, period>;
  using time_point = chrono::time_point</*unspecified*/, duration>;
  static constexpr bool is_steady = /*unspecified*/ ;
  static time_point now() noexcept;
};

二次

代码语言：txt
复制
 ? cppreference.com

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