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std::chrono::time_point::time_since_epoch

提供: cppreference.com
< cpp‎ | chrono‎ | time point

 
 
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可変個引数関数
日付と時刻
関数オブジェクト
initializer_list(C++11)
bitset
hash(C++11)
関係演算子
Original:
Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
ペアとタプル
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Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
フォワード、スワップ、および移動
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Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
 
std::chrono::time_point
メンバ関数
Original:
Member functions
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time_point::time_point
time_point::time_since_epoch
time_point::operator+
time_point::operator-
time_point::min
time_point::max
非メンバ関数
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Non-member functions
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common_type
operator+
operator-
operator==
operator!=
operator<
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operator>
operator>=
time_point_cast
 
std::chrono::duration time_since_epoch() const;
std::chrono::duration*thisのエポックの間の時間を表すclockを返します。.
Original:
Returns a std::chrono::duration representing the amount of time between *this and the clock's epoch.
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[編集] パラメータ

(なし)
Original:
(none)
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[編集] 値を返します

このtime_pointclockのエポックの間の時間
Original:
the amount of time between this time_point and the clock's epoch
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[編集]

#include <iostream>
#include <chrono>
#include <ctime>
 
int main()
{
    std::chrono::time_point<std::chrono::system_clock> p1, p2, p3;
 
    p2 = std::chrono::system_clock::now();
    p3 = p2 - std::chrono::hours(24);
 
    std::time_t epoch_time = std::chrono::system_clock::to_time_t(p1);
    std::cout << "epoch: " << std::ctime(&epoch_time);
    std::time_t today_time = std::chrono::system_clock::to_time_t(p2);
    std::cout << "today: " << std::ctime(&today_time);
 
    std::cout << "hours since epoch: "
              << std::chrono::duration_cast<std::chrono::hours>(
                   p2.time_since_epoch()).count() 
              << '\n';
    std::cout << "yesterday, hours since epoch: "
              << std::chrono::duration_cast<std::chrono::hours>(
                   p3.time_since_epoch()).count() 
              << '\n';
}

Possible output:

epoch: Wed Dec 31 19:00:00 1969
today: Tue Jun 19 12:05:37 2012
hours since epoch: 372256
yesterday, hours since epoch: 372232