std::chrono::operator==,<=>(std::chrono::day)
来自cppreference.com
定义于头文件 <chrono>
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constexpr bool operator==( const std::chrono::day& x, const std::chrono::day& y ) noexcept; |
(1) | (C++20 起) |
constexpr std::strong_ordering operator<=>( const std::chrono::day& x, const std::chrono::day& y ) noexcept; |
(2) | (C++20 起) |
比较二个 std::chrono::day x
和 y
。
<
、 <=
、 >
、 >=
及 !=
运算符分别从 operator<=>
与 operator==
合成。
返回值
1) unsigned(x) == unsigned(y)
2) unsigned(x) <=> unsigned(y)
示例
运行此代码
#include <iostream> #include <chrono> int main() { std::chrono::day d1{15}; std::chrono::day d2{20}; d1 == d2 ? std::cout << "d1 and d2 are equal\n" : std::cout << "d1 and d2 are not equal\n"; using namespace std::literals::chrono_literals; std::cout << std::boolalpha << (6d < 9d) << ' ' << (6d == 6d) << ' ' << (6d <= 9d) << ' ' << (9d > 6d) << ' ' << (9d != 6d) << ' ' << (9d >= 6d) << '\n'; }
输出:
d1 and d2 are not equal true true true true true true