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

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< cpp‎ | chrono‎ | year month day
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C-style date and time
std::chrono::year_month_day
Defined in header <chrono>
constexpr bool operator== ( const std::chrono::year_month_day & x,
const std::chrono::year_month_day & y ) noexcept ;
(1) (since C++20)
constexpr std::strong_ordering

operator<=> ( const std::chrono::year_month_day & x,

const std::chrono::year_month_day & y ) noexcept ;
(2) (since C++20)

Compares the two year_month_day values x and y. This is a lexicographical comparison: the year() is compared first, then month(), then day()

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

Return value

1) x.year ( ) == y.year ( ) && x.month ( ) == y.month ( ) && x.day ( ) == y.day ( )
2) If x.year ( ) <=> y.year ! = 0 , x.year() <=> y.year; otherwise if x.month ( ) <=> y.month ( ) ! = 0 , x.month() <=> y.month() ; otherwise x.day() <=> y.day()

Notes

If both x and y represent valid dates ( x.ok ( ) && y.ok ( ) == true

Example

Run this code
#include <chrono>
 
int main()
{
    constexpr auto ymd1{std::chrono::day(13)/7/1337};
    constexpr auto ymd2{std::chrono::year(1337)/7/13};
    static_assert(ymd1 == ymd2);
    static_assert(ymd1 <= ymd2);
    static_assert(ymd1 >= ymd2);
    static_assert(ymd1 <=> ymd2 == 0);
}
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