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std::literals::chrono_literals::operator""s

科技促进发展：文字：[医]文字：：运算符“s”

Defined in header ​​
constexpr chrono::seconds operator "" s(unsigned long long secs(1)(since C++14)
constexpr chrono::duration</*unspecified*/> operator "" s(long double secs(2)(since C++14)

形成std::chrono::duration文字代表秒。

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

2%29浮点文字，返回相等于std::chrono::seconds

参数

secs-the number of seconds

返回值

大std::chrono::duration字面上的。

可能的实施

参数：：秒操作符“s%28 unsited长s%29{返回std：：秒%28s%29；}conexpr std：：crono：：工期<long double>运算符“s%28 long Double s%29{返回std：：chrono：：工期<long double>%28S%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。

std::string还定义operator""s，以表示类型的文字对象。std::string，但是它是一个字符串文本：10s是十秒钟，但是"10"s是两个字符的字符串。

例

二次

#include <iostream>
#include <chrono>
 
int main()
{
    using namespace std::chrono_literals;
    auto halfmin = 30s;
    std::cout << "half a minute is " << halfmin.count() << " seconds\n"
              << "a minute and a half is " << (1min + 30s).count() << " seconds\n";
}

二次

产出：

二次

half a minute is 30 seconds
a minute and a half is 90 seconds

二次

另见

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

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在CreativeCommonsAttribution下授权-ShareAlike未移植许可v3.0。

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