Defined in header <chrono> | ||
---|---|---|
constexpr std::chrono::milliseconds operator "" ms(unsigned long long ms); | (1) | (since C++14) |
constexpr std::chrono::duration</*unspecified*/, std::milli> operator "" ms(long double ms); | (2) | (since C++14) |
Forms a std::chrono::duration
literal representing milliseconds.
std::chrono::milliseconds(ms)
std::chrono::milliseconds
Parameters
ms | - | the number of milliseconds |
Return value
The std::chrono::duration
literal.
Possible implementation
constexpr std::chrono::milliseconds operator ""ms(unsigned long long ms) { return chrono::milliseconds(ms); } constexpr std::chrono::duration<long double, std::milli> operator ""ms(long double ms) { return std::chrono::duration<long double, std::milli>(ms); } |
Notes
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 duration classes, the duration literal operators become visible as well.
Example
#include <iostream> #include <chrono> int main() { using namespace std::chrono_literals; auto d1 = 250ms; std::chrono::milliseconds d2 = 1s; std::cout << "250ms = " << d1.count() << " milliseconds\n" << "1s = " << d2.count() << " milliseconds\n"; }
Output:
250ms = 250 milliseconds 1s = 1000 milliseconds
See also
constructs new duration (public member function of std::chrono::duration ) |
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