Я создал момент времени, но не могу распечатать его на терминале.
#include
#include
int main(){
//set time_point to current time
std::chrono::time_point time_point;
time_point = std::chrono::system_clock::now();
//print the time
//...
return 0;
}
Единственная документация, которая печатает time_point, которую я могу найти, находится здесь:
http://en.cppreference.com/w/cpp/chrono/time_point
однако я даже не могу создать time_t на основе моей time_point (как в примере).
std::time_t now_c = std::chrono::system_clock::to_time_t(time_point); //does not compile
Ошибка:
/usr/lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/chrono: In instantiation of ‘constexpr std::chrono::time_point::time_point(const std::chrono::time_point&) [with _Dur2 = std::chrono::duration; _Clock = std::chrono::system_clock; _Dur = std::chrono::duration]’:
time.cpp:13:69: required from here
/usr/lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/chrono:540:32: error: no matching function for call to ‘std::chrono::duration::duration(std::chrono::time_point::duration)’
/usr/lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/chrono:540:32: note: candidates are:
/usr/lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/chrono:247:14: note: template constexpr std::chrono::duration::duration(const std::chrono::duration&)
/usr/lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/chrono:247:14: note: template argument deduction/substitution failed:
/usr/lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/chrono:243:46: error: no type named ‘type’ in ‘struct std::enable_if’
/usr/lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/chrono:240:23: note: template constexpr std::chrono::duration::duration(const _Rep2&)
/usr/lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/chrono:240:23: note: template argument deduction/substitution failed:
/usr/lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/chrono:236:27: error: no type named ‘type’ in ‘struct std::enable_if’
/usr/lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/chrono:234:12: note: constexpr std::chrono::duration::duration(const std::chrono::duration&) [with _Rep = long int; _Period = std::ratio]
/usr/lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/chrono:234:12: note: no known conversion for argument 1 from ‘std::chrono::time_point::duration {aka std::chrono::duration}’ to ‘const std::chrono::duration&’
/usr/lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/chrono:232:12: note: constexpr std::chrono::duration::duration() [with _Rep = long int; _Period = std::ratio]
/usr/lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/chrono:232:12: note: candidate expects 0 arguments, 1 provided
Подробнее здесь: https://stackoverflow.com/questions/157 ... time-point
