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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../numeric/ratio/ratio_equal.html below:

std::ratio_equal - cppreference.com

(since C++11)

If the ratios R1 and R2 are equal, provides the member constant value equal true. Otherwise, value is false.

[edit] Helper variable template

template< class R1, class R2 > constexpr bool ratio_equal_v = ratio_equal<R1, R2>::value;

(since C++17) Inherited from std::integral_constant Member constants true if R1::num == R2::num && R1::den == R2::den, 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] Possible implementation

template< class R1, class R2 >
struct ratio_equal : public std::integral_constant <
                                 bool,
                                 R1::num == R2::num && R1::den == R2::den
                            > {};

[edit] Example

#include <iostream>
#include <ratio>
 
int main()
{
    constexpr bool equ = std::ratio_equal_v<std::ratio<2,3>,
                                            std::ratio<6,9>>;
    static_assert(equ);
    std::cout << "2/3 " << (equ ? "==" : "!=") << " 6/9\n";
}

Output:

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

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