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

來自 cppreference.com
< cpp‎ | chrono‎ | year
 
 
 
 
定義於標頭檔案 <chrono>
constexpr bool operator==( const std::chrono::year& x,
                           const std::chrono::year& y ) noexcept;
(1) (C++20 起)
constexpr std::strong_ordering operator<=>( const std::chrono::year& x,
                                            const std::chrono::year& y ) noexcept;
(2) (C++20 起)

比較兩個 std::chrono::year xy

<<=>>=!= 運算子分別從 operator<=>operator== 合成

[編輯] 返回值

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

[編輯] 示例

#include <chrono>
#include <iostream>
 
int main()
{
    using namespace std::chrono;
 
    constexpr year y1{2020};
    constexpr year y2{2021};
 
    std::cout << std::boolalpha << (y1 != y2) << '\n';
 
    static_assert((2020y < 2023y) && (2020y == 2020y) && (2020y <= 2023y) &&
                  (2023y > 2020y) && (2023y != 2020y) && (2023y >= 2020y));
}

輸出

true