Namespaces
Variants
Views
Actions

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

From cppreference.com
< cpp‎ | chrono
 
 
Utilities library
General utilities
Relational operators (deprecated in C++20)
Integer comparison functions
(C++20)(C++20)(C++20)   
(C++20)
Swap and type operations
(C++14)
(C++11)

(C++11)
(C++11)
(C++17)
Common vocabulary types
(C++11)
(C++17)
(C++17)
(C++17)
(C++11)
(C++17)

Elementary string conversions
(C++17)
(C++17)

Stacktrace
 
 
 
Defined in header <chrono>
constexpr std::chrono::day operator ""d(unsigned long long d) noexcept;
(1) (since C++20)

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

Contents

[edit] Parameters

d - the day value

[edit] Return value

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

[edit] Possible implementation

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

[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, and 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

#include <iostream>
#include <chrono>
 
int main()
{
    using namespace std::literals::chrono_literals;
 
    std::cout << static_cast<unsigned>(42d) << ' '
              << static_cast<unsigned>(256d) << ' ' // unspecified
              << static_cast<unsigned>(298d) << '\n'; // unspecified
}

Possible output:

42 0 42

[edit] See also

constructs a day
(public member function of std::chrono::day) [edit]
retrieves the stored day value
(public member function of std::chrono::day) [edit]