std::literals::chrono_literals::operator""s
Header: <chrono>
Forms a std::chrono::duration literal representing seconds.
# Declarations
constexpr std::chrono::seconds
operator""s( unsigned long long secs );
(since C++14)
constexpr std::chrono::duration</*unspecified*/>
operator""s( long double secs );
(since C++14)
# Parameters
secs: the number of seconds
# Return value
The std::chrono::duration literal.
# 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:
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.
std::string also defines operator"“s, to represent literal objects of type std::string, but it is a string literal: 10s is ten seconds, but “10"s is a two-character string.
# Example
#include <chrono>
#include <iostream>
int main()
{
using namespace std::chrono_literals;
std::chrono::seconds halfmin = 30s;
std::cout << "Half a minute is " << halfmin.count() << " seconds"
" (" << halfmin << ").\n"
"A minute and a second is " << (1min + 1s).count() << " seconds.\n";
std::chrono::duration moment = 0.1s;
std::cout << "A moment is " << moment.count() << " seconds"
" (" << moment << ").\n"
"And thrice as much is " << (moment + 0.2s).count() << " seconds.\n";
}