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

From cppreference.com
< cpp‎ | chrono‎ | year month
C++
Date and time library
Time point
(C++11)
(C++20)
Duration
(C++11)
Clocks
(C++11)
(C++11)
(C++20)
(C++20)
(C++20)
(C++11)
(C++20)
(C++20)
(C++20)
Time of day
(C++20)(C++20)
(C++20)(C++20)
(C++20)

Calendar
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)(C++20)
Time zone
(C++20)
(C++20)
(C++20) (C++20) (C++20) (C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
chrono I/O
(C++20)
C-style date and time
std::chrono::year_month
Defined in header <chrono>
constexpr bool operator== ( const std::chrono::year_month & x,
const std::chrono::year_month & y ) noexcept ;
(1) (since C++20)
constexpr std::strong_ordering operator<=> ( const std::chrono::year_month & x,
const std::chrono::year_month & y ) noexcept ;
(2) (since C++20)

Compares the two year_month values x and y.

The <, <=, >, >=, and != operators are synthesized from operator<=> and operator==

Return value

1) x.year ( ) == y.year ( ) && x.month ( ) == y.month ( )
2) x.year ( ) <=> y.year ( ) ! = 0 ? x.year ( ) <=> y.year ( ) : x.month ( ) <=> y.month ( )

Example

Run this code
#include <chrono>
#include <iostream>
 
int main()
{
    using namespace std::chrono;
 
    constexpr year_month ym1{year(2021), month(7)};
    constexpr year_month ym2{year(2021)/7};
    static_assert(ym1 == ym2);
    std::cout << ym1 << '\n';
 
    static_assert((2020y/1 < 2020y/2) && (2020y/2 == 2020y/2) && (2020y/3 <= 2021y/3) &&
                  (2023y/1 > 2020y/2) && (3020y/2 != 2020y/2) && (2020y/3 >= 2020y/3));
}

Output: 

2021/Jul
Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/chrono/year_month/operator_cmp&oldid=161687