std::literals::chrono_literals::operator""y

 

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chrono I/O
parse (C++20)
C-style date and time

 

std::chrono::year

Member functions

year::year

year::operator++year::operator--

year::operator+=year::operator-=

year::operator+year::operator-

year::is_leap

year::operator int

year::ok

year::min

year::max

Nonmember functions

operator==operator<=>

operator+operator-

operator<<

from_stream

operator""y

Helper classes

formatter<std::chrono::year>

hash<std::chrono::year> (C++26)

 

Defined in header <chrono>
constexpr std::chrono::year operator""y( unsigned long long y ) noexcept;		(since C++20)

Forms a std::chrono::year literal representing a year in the proleptic Gregorian calendar.

Parameters

y

-

the year value

Return value

A std::chrono::year initialized from int(y). If y is not in the range [-32767, 32767], the stored value is unspecified.

Possible implementation

constexpr std::chrono::year operator""y(unsigned long long y) noexcept { return std::chrono::year(static_cast<int>(y)); }

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

Run this code

#include <chrono>
#include <iostream>
 
int main()
{
    using namespace std::literals;
 
    std::cout << int(2020y)  << '\t' << 2020y  << '\n'
              << int(-220y)  << '\t' << -220y  << '\n'
              << int(3000y)  << '\t' << 3000y  << '\n'
              << int(32768y) << '\t' << 32768y << '\n'  // unspecified
              << int(65578y) << '\t' << 65578y << '\n'; // unspecified
}

Possible output:

2020	2020
-220	-0220
3000	3000
-32768	-32768 is not a valid year
42	0042

See also

(constructor)

constructs a year (public member function of std::chrono::year)