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std::literals::chrono_literals::operator""us

科技促进发展：文字：[医]文字：：运算符“我们”

Defined in header ​​
constexpr std::chrono::microseconds operator "" us(unsigned long long us(1)(since C++14)
constexpr std::chrono::duration</*unspecified*/, std::micro> operator "" us(long double us(2)(since C++14)

形成std::chrono::duration文字代表微秒。

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

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

参数

us-the number of microseconds

返回值

大std::chrono::duration字面上的。

可能的实施

conexpr std：：micro秒操作符“us%28 unsigned long us%29”{返回std：：microsec%28us%29；}conpexpr std：：time：：time<long Double，std：：微>操作符“us%28 long Double us%29{reback：：time：：time<long Double，std：：microus>%28us%29；}”“us%28 long Double us%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 = 250us;
    std::chrono::microseconds d2 = 1ms;
    std::cout << "250us = " << d1.count() << " microseconds\n"
              << "1ms = " << d2.count() << " microseconds\n";
}

二次

产出：

二次

250us = 250 microseconds
1ms = 1000 microseconds

二次

另见

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

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http：//en.cppreference.com/w/cpp/chrono/Operator[医]q[医][医]q[医]我们

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