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std::literals::chrono_literals::operator""d(3) | C++ Standard Libary | std::literals::chrono_literals::operator""d(3) |
NAME¶
std::literals::chrono_literals::operator""d - std::literals::chrono_literals::operator""d
Synopsis¶
Defined in header <chrono>
constexpr std::chrono::day operator ""d(unsigned long long d)
(1) (since C++20)
noexcept;
Forms a std::chrono::day literal representing a day of the month in the
calendar.
Parameters¶
d - the day value
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,
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.
Example¶
// Run this code
#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
See also¶
constructor constructs a day
(public member function of std::chrono::day)
operator unsigned retrieves the stored day value
(public member function of std::chrono::day)
2022.07.31 | http://cppreference.com |