std::literals::chrono_literals::operator""y
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std::chrono::year
Member functions
Nonmember functions
operator""y
Helper classes
(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.
[edit] Parameters
y
-
the year value
[edit] Return value
A std::chrono::year initialized from int(y). If y is not in the range [-32767, 32767], the stored value is unspecified.
[edit] Possible implementation
constexpr std::chrono::year operator""y(unsigned long long y) noexcept { return std::chrono::year (static_cast<int>(y)); }
[edit] 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.
[edit] 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