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>)