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std::ratio_less

性病：：比率[医]再少点

Defined in header ​​
template< class R1, class R2 > struct ratio_less : std::integral_constant;​​

如果r1小于r2，则提供成员常量。value平等true.否则，value是false...

辅助变量模板

template< class R1, class R2 > inline constexpr bool ratio_less_v = ratio_less::value;​(since C++17)

继承自STD：积分[医]常量

成员常数

value statictrue if R1::num * R2::den < R2::num * R1::den, or equivalent expression that avoids overflow , false otherwise (public static member constant)

成员函数

operator boolconverts the object to bool, returns value (public member function)
operator() (C++14)returns value (public member function)

成员类型

TypeDefinition
value_typebool
typestd::integral_constant<bool, value>

例

二次

#include <iostream>
#include <ratio>
 
int main()
{
    if (std::ratio_less<std::ratio<23,37>, std::ratio<57,90>>::value) {
        std::cout << "23/37 < 57/90\n";
    }
}

二次

产出：

二次

23/37 < 57/90

二次

另见

二次

*。

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