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# std::literals::chrono_literals::operator""min

From cppreference.com
< cpp‎ | chrono

Defined in header `<chrono>` |  |
constexpr chrono::minutes operator "" min(unsigned long long mins); | (1) | (since C++14)
constexpr chrono::duration</*unspecified*/, ratio<60,1>> operator "" min(long double mins); | (2) | (since C++14)

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

1) integer literal, returns exactly std::chrono::minutes(mins)
2) floating-point literal, returns a floating-point duration equivalent to std::chrono::minutes

### [edit] Parameters

minutes | - | the number of minutes

### [edit] Return value

The std::chrono::duration literal.

### [edit] Possible implementation

    constexpr std::chrono::minutes operator ""min(unsigned long long m)
    {
        return std::chrono::minutes(m);
    }
    constexpr std::chrono::duration<long double,
                                    std::ratio<60,1>> operator ""min(long double m)
    {
        return std::chrono::duration<long double, ratio<60,1>> (m);
    }

### [edit] Notes

These operators are declared in the namespace `std::literals::chrono_literals`, where both `literals` and `chrono_literals` are inline namespaces. Access to these operators 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 duration classes, the duration literal operators become visible as well.

### [edit] Example

Run this code

    #include <iostream>
    #include <chrono>

    int main()
    {
        using namespace std::chrono_literals;
        auto lesson = 45min;
        auto halfmin = 0.5min;
        std::cout << "one lesson is " << lesson.count() << " minutes\n"
                  << "half a minute is " << halfmin.count() << " minutes\n";
    }

Output:

    one lesson is 45 minutes
    half a minute is 0.5 minutes

### [edit] See also

(constructor) | constructs new duration (public member function of `std::chrono::duration`) [edit]

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