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

std::ratio_not_equal - cppreference.com

(since C++11)

If the ratios R1 and R2 are not equal, provides the member constant value equal true. Otherwise, value is false.

[edit] Helper variable template

template< class R1, class R2 > constexpr bool ratio_not_equal_v = ratio_not_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 [edit] Example

#include <ratio>
 
static_assert(std::ratio_not_equal_v<std::ratio<6, 9>, std::ratio<9, 6>>, "6/9 != 9/6");
 
int main() {}

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

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