std::literals::chrono_literals::operator""min (3) - Linux Manuals

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


std::literals::chrono_literals::operator""min - std::literals::chrono_literals::operator""min


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

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


minutes - the number of minutes

Return value

The std::chrono::duration literal.

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);


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 classes in the chrono library, the corresponding literal operators become visible as well.


// 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";


  one lesson is 45 minutes
  half a minute is 0.5 minutes

See also

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