std::literals::chrono_literals:: operator""d

Forms a std::chrono::day literal representing a day of the month in the calendar.

Parameters

Return value

A std::chrono::day storing d . If d > 255 , the stored value is unspecified.

Possible implementation

constexpr std::chrono::day operator ""d(unsigned long long d) noexcept
{
    return std::chrono::day(d);
}

Notes

This operator is declared in the namespace std :: literals :: chrono_literals , where both literals and chrono_literals are inline namespaces . Access to this operator can be gained with:

• using namespace std :: literals ,
• using namespace std :: chrono_literals , or
• using namespace std :: literals :: chrono_literals .

In addition, within the namespace std :: chrono , the directive using namespace literals :: chrono_literals ; is provided by the standard library , so that if a programmer uses using namespace std :: chrono ; to gain access to the classes in the chrono library , the corresponding literal operators become visible as well.

Example

#include <chrono>
#include <iostream>
 
int main()
{
    using namespace std::literals::chrono_literals;
 
    std::cout << static_cast<unsigned>(42d) << '\t' << 42d << '\n'
              << static_cast<unsigned>(256d) << '\t' << 256d << '\n' // unspecified
              << static_cast<unsigned>(298d) << '\t' << 298d << '\n'; // unspecified
}

42      42 is not a valid day
0       00 is not a valid day
42      42 is not a valid day

See also