std::chrono::operator==,<=>(std::chrono::year)
来自cppreference.com
定义于头文件 <chrono>
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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) |
比较二个 std::chrono::year x
与 y
。
<
、 <=
、 >
、 >=
及 !=
运算符分别从 operator<=>
与 operator==
合成。
返回值
1) int(x) == int(y)
2) int(x) <=> int(y)
示例
运行此代码
#include <iostream> #include <chrono> int main() { using namespace std::chrono; constexpr year y1{2020}; constexpr year y2{2021}; if (y1 == y2) { std::cout << "y1 and y2 are equal\n"; } else { std::cout << "y1 and y2 are not equal\n"; } static_assert( (2020y < 2023y) && (2020y == 2020y) && (2020y <= 2023y) && (2023y > 2020y) && (2023y != 2020y) && (2023y >= 2020y) ); }
输出:
y1 and y2 are not equal