| Technical Specification | ||||
| Filesystem library(filesystem TS) | ||||
| Library fundamentals(library fundamentals TS) | ||||
| Library fundamentals 2(library fundamentals TS v2) | ||||
| Library fundamentals 3(library fundamentals TS v3) | ||||
| Extensions for parallelism(parallelism TS) | ||||
| Extensions for parallelism 2(parallelism TS v2) | ||||
| Extensions for concurrency(concurrency TS) | ||||
| Extensions for concurrency 2(concurrency TS v2) | ||||
| Concepts(concepts TS) | ||||
| Ranges(ranges TS) | ||||
| Reflection(reflection TS) | ||||
| Mathematical special functions(special functions TR) | ||||
| Experimental Non-TS | ||||
| Pattern Matching | ||||
| Linear Algebra | ||||
| std::execution | ||||
| Contracts | ||||
| 2D Graphics |
| Classes | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Functions | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| File types | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Defined in header <experimental/filesystem> | ||
using file_time_type= chrono::time_point</*trivial-clock*/>; | (filesystem TS) | |
Represents file time.trivial-clock is an implementation-defined type that satisfiesTrivialClock and is sufficient to represent the resolution and range of the file time values offered by the filesystem.
#include <chrono>#include <experimental/filesystem>#include <fstream>#include <iomanip>#include <iostream>namespace fs= std::experimental::filesystem;usingnamespace std::chrono_literals; int main(){ fs::path p= fs::current_path()/"example.bin";std::ofstream(p.c_str()).put('a');// create fileauto ftime= fs::last_write_time(p); std::time_t cftime= decltype(ftime)::clock::to_time_t(ftime);// assuming system_clockstd::cout<<"File write time is "<<std::asctime(std::localtime(&cftime))<<'\n'; fs::last_write_time(p, ftime+ 1h);// move file write time 1 hour to the future ftime= fs::last_write_time(p);// read back from the filesystem cftime= decltype(ftime)::clock::to_time_t(ftime);std::cout<<"File write time is "<<std::asctime(std::localtime(&cftime))<<'\n'; fs::remove(p);}
Possible output:
File write time is Tue Mar 31 19:47:04 2015 File write time is Tue Mar 31 20:47:04 2015
| gets or sets the time of the last data modification (function)[edit] |
