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std::literals::chrono_literals::operator""ms

科技促进发展：文字：[医]文字：：运算符“ms”

Defined in header ​​
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)

形成std::chrono::duration表示毫秒的文字。

1%29整数字面值，准确返回std::chrono::milliseconds(ms)

2%29浮点文字，返回相等于std::chrono::milliseconds

参数

ms-the number of milliseconds

返回值

大std::chrono::duration字面上的。

可能的实施

conexpr std：：millisecms操作符“ms%28 unsited long ms%29{返回时间：毫秒%28 ms%29；}conexpr std：：time：：time：：time：<long Double，std：：Milli>操作符”ms%28long Double ms%29{返回std：crono：：time<long Double，std：：Milli>%28 ms%29；}

*。

注记

这些运算符在命名空间中声明。std::literals::chrono_literals，两者都是literals和chrono_literals是内联命名空间。可以通过以下方式访问这些操作员using namespace std::literals，，，using namespace std::chrono_literals，和using namespace std::literals::chrono_literals...

此外，在命名空间中std::chrono，指令using namespace literals::chrono_literals;由标准库提供，因此如果程序员使用using namespace std::chrono;要获得对工期类的访问权限，工期文字运算符也会变得可见。

例

二次

#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";
}

二次

产出：

二次

250ms = 250 milliseconds
1s = 1000 milliseconds

二次

另见

(constructor)constructs new duration (public member function of std::chrono::duration)

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