std::literals::chrono_literals::operator""ns

Forms a std::chrono::duration literal representing nanoseconds.

Parameters

Return value

The std::chrono::duration literal.

Possible implementation

constexpr std::chrono::nanoseconds operator""ns(unsigned long long ns)
{
    return std::chrono::nanoseconds(ns);
}
constexpr std::chrono::duration<long double, std::nano> operator""ns(long double ns)
{
    return std::chrono::duration<long double, std::nano>(ns);
}

Notes

This operator is declared in the namespace std::literals::chrono_literals, where both literals and chrono_literals are inline namespaces

• 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

Example

#include <chrono>
#include <iostream>
 
int main()
{
    using namespace std::chrono_literals;
    auto d1{250ns};
    std::chrono::nanoseconds d2{1us};
    std::cout << d1 << " = " << d1.count() << " nanoseconds\n"
              << d2 << " = " << d2.count() << " nanoseconds\n";
}

250ns = 250 nanoseconds
1000ns = 1000 nanoseconds

See also