std::chrono::operator==,<=>(std::chrono::year)
来自 cppreference.cn
定义于头文件 <chrono> |
||
constexpr bool operator==( const std::chrono::year& x, const std::chrono::year& y ) noexcept; |
(1) | (始于 C++20) |
constexpr std::strong_ordering operator<=>( const std::chrono::year& x, const std::chrono::year& y ) noexcept; |
(2) | (始于 C++20) |
比较两个 std::chrono::year x 和 y。
<、<=、>、>= 和 != 运算符分别从 operator<=> 和 operator== 合成。
[编辑] 返回值
1) int(x) == int(y)
2) int(x) <=> int(y)
[编辑] 示例
运行此代码
#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)); }
输出
true