std::litera...perator""ns(3)

std::litera...perator""ns(3) 💅

okay so this is the C++ Standard Libary manual page for std::literals::chrono_literals::operator""ns — yes, the header spells “Libary” like that, and we are not fixing it, bestie. It's giving “tiny time unit literal realness,” and it's lowkey iconic. 🕰️✨

---

✨ NAME ✨

std::literals::chrono_literals::operator""ns — and fr fr, that's the whole name: std::literals::chrono_literals::operator""ns

🌸 Synopsis

Defined in header <chrono>.

constexpr std::chrono::nanoseconds                          (1)
(since C++14)
    operator""ns( unsigned long long nsec );
constexpr std::chrono::duration</*unspecified*/, std::nano> (2)
(since C++14)
    operator""ns( long double nsec );

It forms a std::chrono::duration literal representing nanoseconds. Here's the tea:

1. Integer literal — returns exactly std::chrono::nanoseconds(nsec).
2. Floating-point literal — returns a floating-point duration equivalent to std::chrono::nanoseconds.

💅 Parameters

• nsec — the number of nanoseconds. that's the parameter, bestie 💖

🦋 Return value

The std::chrono::duration literal. periodt. ✨

🔥 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. 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. slay. 🌈

🎀 Example

// Run this code

#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";
}

⭐ Output

250ns = 250 nanoseconds
1000ns = 1000 nanoseconds

👑 See also

• constructor — constructs new duration (public member function of std::chrono::duration<Rep,Period>)

---

source: http://cppreference.com — version/date: 2024.06.10 — bye bestie, go count some nanoseconds 💖✨