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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../numeric/ratio/ratio_less.html below:

std::ratio_less - cppreference.com

(since C++11)

If the ratio R1 is less than the ratio R2, provides the member constant value equal true. Otherwise, value is false.

[edit] Helper variable template

template< class R1, class R2 > constexpr bool ratio_less_v = ratio_less<R1, R2>::value;

(since C++17) Inherited from std::integral_constant Member constants true if R1::num * R2::den < R2::num * R1::den, or equivalent expression that avoids overflow, false otherwise
(public static member constant) Member functions converts the object to bool, returns value
(public member function) returns value
(public member function) Member types [edit] Example

#include <iostream>
#include <ratio>
 
int main()
{
    using x = std::ratio<69, 90>;
    using y = std::ratio<70, 90>;
 
    if constexpr (std::ratio_less_v<x, y>)
        std::cout << x::num << '/' << x::den << " < "
                  << y::num << '/' << y::den << '\n';
}

Output:

[edit] See also compares two ratio objects for greater than at compile-time
(class template) [edit]

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