std::litera...:operator""s(3)

💖 NAME 💖

Hey bestie, this is the manual page for std::litera...:operator""s(3) from the C++ Standard Libary. The NAME section is giving twin-flame energy, no cap: std::literals::chrono_literals::operator""s - std::literals::chrono_literals::operator""s. Iconic. 💅

✨ Synopsis ✨

Defined in header <chrono>.

constexpr std::chrono::seconds                   (1) (since C++14)
    operator""s( unsigned long long secs );
constexpr std::chrono::duration</*unspecified*/> (2) (since C++14)
    operator""s( long double secs );

This forms a std::chrono::duration literal representing seconds. Periodt. 🕰️

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

🎀 Parameters 🎀

• secs — the number of seconds.

That's the parameter, and she's booked and busy. 🎀

🫶 Return value 🫶

The std::chrono::duration literal. That's it, that's the return. 🫶

🔥 Possible implementation 🔥

Here's the possible implementation, looking cute:

constexpr std::chrono::seconds operator""s(unsigned long long s)
{
    return std::chrono::seconds(s);
}
constexpr std::chrono::duration<long double> operator""s(long double s)
{
    return std::chrono::duration<long double>(s);
}

💜 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.

std::string also defines operator""s, to represent literal objects of type std::string, but it is a string literal: 10s is ten seconds, but "10"s is a two-character string. Same letter, different lore, bestie. 😭

🌈 Example 🌈

// Run this code

#include <chrono>
#include <iostream>

int main()
{
    using namespace std::chrono_literals;

    std::chrono::seconds halfmin = 30s;
    std::cout << "Half a minute is " << halfmin.count() << " seconds"
        " (" << halfmin << ").\n"
        "A minute and a second is " << (1min + 1s).count() << " seconds.\n";

    std::chrono::duration moment = 0.1s;
    std::cout << "A moment is " << moment.count() << " seconds"
        " (" << moment << ").\n"
        "And thrice as much is " << (moment + 0.2s).count() << " seconds.\n";
}

Output:

Half a minute is 30 seconds (30s).
A minute and a second is 61 seconds.
A moment is 0.1 seconds (0.1s).
And thrice as much is 0.3 seconds.

👀 See also 👀

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

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Okay bye, bestie! This was std::litera...:operator""s(3) from the C++ Standard Libary manual. Footer sign-off vibes: source http://cppreference.com, version/date 2024.06.10, and the page name std::litera...:operator""s(3). Mwah 💋