std::literals::chrono_literals::operator""min
From cppreference.com
C++
Feature test macros (C++20)
Concepts library (C++20)
Metaprogramming library (C++11)
Ranges library (C++20)
Filesystem library (C++17)
Concurrency support library (C++11)
Execution control library (C++26)
Date and time library
(C++11)
(C++20)
(C++20)
(C++11)
(C++11)
(C++11)
(C++20)
(C++20)
(C++20)
(C++11)
(C++20)
(C++20)
(C++20)
(C++20)(C++20)
(C++20)(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)(C++20)
(C++20)
(C++20)
(C++20)
(C++20)(C++20)(C++20)(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
std::chrono::duration
Member functions
Non-member functions
(until C++20)(C++20)
(C++20)
(C++17)
(C++17)
(C++17)
(C++17)
(C++14)
operator""min
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
(C++20)
Helper classes
Defined in header
<chrono>
constexpr chrono::minutes
operator""min( unsigned long long mins );
(1)
(since C++14)
operator""min( unsigned long long mins );
constexpr chrono::duration</*unspecified*/, ratio<60,1>>
operator""min( long double mins );
(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 .
[edit] Parameters
mins
-
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
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.
[edit] 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)