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std::chrono:: operator==,<=> (std::chrono::month)

From cppreference.net
C++
Date and time library
std::chrono::month
定义于头文件 <chrono>
constexpr bool operator == ( const std:: chrono :: month & x,
const std:: chrono :: month & y ) noexcept ;
(1) (C++20 起)
constexpr std:: strong_ordering operator <=> ( const std:: chrono :: month & x,
const std:: chrono :: month & y ) noexcept ;
(2) (C++20 起)

比较两个 std::chrono::month x 与 y 。

< 、 <= 、 > 、 >= 和 != 运算符分别由 operator <=> 和 operator == 合成。

返回值

1) unsigned ( x ) == unsigned ( y )
2) unsigned ( x ) <=> unsigned ( y )

示例

运行此代码 
#include <chrono>
int main()
{
    constexpr std::chrono::month m1{6}, m2{8};
    static_assert
    (
        m1 < m2 && m1 == m1 && m1 <= m2 &&
        m2 > m1 && m2 != m1 && m2 >= m1 &&
        m1 <=> m2 != 0
    );
}