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std:: ratio_greater_equal

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ratio_greater_equal
(C++11)
定义于头文件 <ratio>
template < class R1, class R2 >
struct ratio_greater_equal : std:: integral_constant < bool , /* 见下文 */ > { } ;
(C++11 起)

如果比率 R1 大于或等于比率 R2 ，则提供成员常量 value 等于 true 。否则， value 为 false 。

目录

辅助变量模板

template < class R1, class R2 >
constexpr bool ratio_greater_equal_v = ratio_greater_equal < R1, R2 > :: value ;
(C++17 起)

继承自 std:: integral_constant

成员常量

value
[static]
若 R1 :: num * R2 :: den >= R2 :: num * R1 :: den 或可避免溢出的等价表达式成立则为 true ，否则为 false
(公开静态成员常量)

成员函数

operator bool
转换对象为 bool 类型，返回 value
(公开成员函数)
operator()
(C++14)
返回 value
(公开成员函数)

成员类型

类型 定义
value_type bool
type std:: integral_constant < bool , value >

示例

运行此代码 
#include <ratio>
int main()
{
    static_assert(std::ratio_greater_equal<
        std::ratio<2, 3>,
        std::ratio<2, 3>>::value, "2/3 >= 2/3");
    // 自 C++17 起
    static_assert(std::ratio_greater_equal_v<
        std::ratio<999'998, 999'999>,
        std::ratio<999'997, 999'998>>);
}

参见

(C++11)
在编译期比较两个 ratio 对象是否相等
(类模板)
(C++11)
在编译期比较两个 ratio 对象的 小于 关系
(类模板)