std::literals::chrono_literals::operator""min(3)

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

Synopsis
   Defined in header <chrono>
   constexpr chrono::minutes (1) (since C++14)
       operator""min( unsigned long long mins );
   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.

Parameters
   mins - 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);
   }

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.

Example

// Run this code
 #include <chrono>
 #include <iostream>

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

Output:
 One lesson is 45 minutes (45min)
 Half a minute is 0.5 minutes (0.5min)

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