c++ - 将 minutes::rep 转换为 hours::rep

Question

我应该如何继续将 std::chrono::minutes::rep 类型值转换为小时表示。

#include <iostream>
#include <chrono>

using namespace std;
using namespace std::chrono;

int main() {
    minutes::rep time = 4;
    std::cout << time;  // outputs as minutes, need in hours

    // duration cast doesn't seems to work here because it
    // needs minutes instead of minutes::rep probably

    return 0;
}

Answer 1

minutes::rep time = 4;
std::cout << time;  // outputs as minutes, need in hours

因为 time 只是一个(实现定义的)整数类型，它与 minutes 或 hours 无关，并且对基础时间表示一无所知。

您想停留在duration 领域:

minutes time{4};
auto as_hours = std::duration_cast<hours>(time);
std::cout << as_hours.count(); // prints 0

或者，可能:

auto as_hours_dbl = std::duration_cast<duration<double, hours::period>>(time);
std::cout << as_hours_dbl.count(); // prints 0.0666667