std::ratio_equal

Since C++11

Header: <ratio>

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

# Declarations

template< class R1, class R2 >
struct ratio_equal : std::integral_constant<bool, /* see below */> { };

(since C++11)

# 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";
}

# See also