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std::literals::chrono_literals::operator""min

科技促进发展：文字：[医]文字：：运算符“min”

Defined in header ​​
constexpr chrono::minutes operator "" min(unsigned long long mins(1)(since C++14)
constexpr chrono::duration</*unspecified*/, ratio<60,1>> operator "" min(long double mins(2)(since C++14)

形成std::chrono::duration文字代表分钟。

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

2%29浮点文字，返回相等于std::chrono::minutes

参数

minutes-the number of minutes

返回值

大std::chrono::duration字面上的。

可能的实施

conexpr std：：time o：：min%28 unsigned长m%29{返回std：：min%28m%29；}conexpr std：：time：：time：<long Double，std：：比率<60，1>运算符“min%28 long Doum%29”{返回std：：time：time：time<长双倍，比率<60，1>%28m%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 lesson = 45min;
    auto halfmin = 0.5min;
    std::cout << "one lesson is " << lesson.count() << " minutes\n"
              << "half a minute is " << halfmin.count() << " minutes\n";
}

二次

产出：

二次

one lesson is 45 minutes
half a minute is 0.5 minutes

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]敏

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