std::chrono::time_point ???? ??, ?, ?, ?, ?, ?, ???? ?? ?? ?? ??? ??? ??? ? ????
Nov 01, 2024 am 06:05 AM
std::chrono::time_point?? ?? ?? ??
??:
std::chrono::time_point ???? ??, ?, ?, ?, ?, ?, ??? ?? ?? ?? ??? ????? ??? ?? ????
?? ??:
time_point?? ??? ??? ????? ?? ??? ??? ???? system_clock::time_point? ???? ???. ?? system_clock::time_point ??:
<code class="cpp">system_clock::time_point now = system_clock::now();</code>
?? time_t ??? ??:
<code class="cpp">time_t tt = system_clock::to_time_t(now);</code>
UTC ??? ?? ?? ????? ?? ??? ??? ?? time_t ?? ?????. tm??:
<code class="cpp">tm utc_tm = *gmtime(&tt); // UTC tm local_tm = *localtime(&tt); // Local</code>
tm ??? ?? ??? ???? ?? ?? ??:
<code class="cpp">std::cout << local_tm.tm_year + 1900 << '\n'; // Year std::cout << local_tm.tm_mon + 1 << '\n'; // Month std::cout << local_tm.tm_mday << '\n'; // Day
?? ??:
?? C ?????? ???? ?? ??? ????? ?? system_clock ??? ????? 1970? 1? 1? UTC ?? ? ??? ???? Unix ??? ???? ??? ?? ???? ?? ?????.
?? ??? ??? ???? ??? ?????. system_clock ???:
<code class="cpp">system_clock::duration tp = now.time_since_epoch(); days d = duration_cast<days>(tp); // Days tp -= d; // Subtract days hours h = duration_cast<hours>(tp); // Hours tp -= h; // Subtract hours ... // Continue for minutes, seconds, and fractional seconds</code>
??? ?? ??? ??? ?????.
<code class="cpp">std::cout << d.count() << "d " << h.count() << ':' << m.count() << ':' << s.count(); std::cout << " " << tp.count() << "[" << system_clock::duration::period::num << '/' << system_clock::duration::period::den << "]\n";
????? ?? ??:
??? ?? ??? ??, date? ?? C 11/14 ????? ??? ??? ???. ??? ?? ??? ??? ??? ?? ?????.
<code class="cpp">auto tp = std::chrono::system_clock::now();
using date::floor; // Namespace for streaming operator
std::cout << tp << '\n'; // Outputs date and time components
auto dp = floor<date::days>(tp); // Omits fractional parts
auto ymd = date::year_month_day{dp};
... // Individual elements can be accessed as members of ymd</code>
C 20 ?? ??:
??? C 20 ?? ???? system_clock?? ??? ??? ???? ?? ?? ??? ???? ????. ??_?:
<code class="cpp">year_month_day ymd{floor<days>(tp)};
hh_mm_ss time{floor<milliseconds>(tp - dp)};
auto y = ymd.year();
auto m = ymd.month();
... // Extract remaining elements similarly</code>? ??? std::chrono::time_point ???? ??, ?, ?, ?, ?, ?, ???? ?? ?? ?? ??? ??? ??? ? ????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!
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std :: Chrono ?? c
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STD :: Chrono? ?? ?? ??, ?? ?? ??, ?? ?? ? ?? ?? ? ?? ?? ??? ???? C?? ???? ??? ?????. 1. std :: chrono :: system_clock :: now ()? ???? ?? ??? ?? ? ??? ?? ??? ???? ?? ? ? ??? ??? ??? ???? ?? ?? ? ????. 2. std :: Chrono :: steady_clock? ???? ?? ??? ???? ?? ??? ???? duration_cast? ?? ?? ?, ? ? ?? ??? ??????. 3. ?? (time_point) ? ?? (??)? ?? ??? ? ? ??? ?? ??? ? ?? epoch (epoch)???? ???????.
C?? ?? ??? ?? ???
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C : 1?? ?? ????? ?? ??? ?? ??? ????. Linux ????? Backtrace ? Backtrace_symbols ??? ??????. ?? ?? ? ?? ?? ??? ???? ??? ? ? -rdynamic ?? ??? ???????. 2. Windows ????? CaptUreStackBackTrace ??? ???? DBGHELP.LIB? ???? PDB ??? ???? ?? ??? ?? ???????. 3. GoogleBreakPad ?? Boost.StackTrace? ?? ?? ?????? ???? ?? ??? ? ?? ?? ??? ??????. 4. ?? ???? ?? ??? ???? ?? ???? ?? ??? ???? ?????.
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C??, POD (PANDALDATA) ??? ??? ??? ?? ??? ???? C ?? ??? ??? ?????. ??? ? ?? ??? ????????. ??? ??? ?? ???? ???, ?? memcpy? ?? ?? ? ? ????. ?? ????? ?? ??? ??? ??? ? ????. ?? ?? ???? ??? ?????. ?? ? ?? ??? ??, ??? ?? ??? ?? ???, ?? ?? ?? ?? ??? ?? ? ?? ? ?? ?? ??? ?????. ?? ?? structpoint {intx; inty;}? pod???. ??? ???? ???? I/O, C ?? ???, ?? ??? ?? ?????. std :: is_pod? ?? ??? POD?? ??? ? ??? C 11 ??? std :: is_trivia? ???? ?? ????.
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C?? ??? ?? ??? ???? ? ?? ?? ??? ???? : ?? ??? ??, std :: ?? ? ?? ??? ? ??? ???. 1. ?? ???? ?? ???? ???? ??? ???? ?? C ?????? ????? ???? ?? ????. 2. STD :: LAMBDA ???? ?? ? ??? ?? C?? ???? ???? ??? ?? ??? ??? ???? ??-?????. 3. ??? ?? ??? ?? ???? ????? ?? ?? ?? ??? ????? ??? ??? ?? ??? ???? ? ????. ????? ???? ??? std :: ?? ?? ???? ?? ??????? ?? ???? ?? ?? ? ? ????.
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std :: c?? ??? ??????
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STD :: MOVE? ??? ???? ???? ?? ??? rvalue ??? ???? ????? ??? ?? ??? ??? ? ??? ?????. ?? ??, ??? ????? ? ???? ???? ???? ???? ?? ?? ??? ???? ?? ?? ?? ???? ?? ? ? ????. ?? ?? ??, ???? ?? ?? ??? ??? ?? ???? ???? ??? ?? ???? ?????? ???????. ??? ?? ????? ???? ???? ??? ????? ???, ?? ?? ??? ??? ?? ???? ????. ??? ????? ?? ? ? ??? ?? ???? ??? ?? ? ??? ??? ?? ??? ???? ?? RVO ???? ?? ??? ? ???? STD :: ??? ???? ???? ??? ? ? ????. ??? ???? ?? ???? ??? ?????? ??, ???? ??? ? ??? ??? ??? ?? ??? ?????.
