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    std::ratio_equal

    From cppreference.com
     
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    Defined in header <ratio>
    template< class R1, class R2 > struct ratio_equal : std::integral_constant<bool, /* see below */> { };
    		 (since C++11)
    See More

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

    Helper variable template

    template< class R1, class R2 > constexpr bool ratio_equal_v = ratio_equal<R1, R2>::value;
    		 (since C++17)
    [edit]

    Inherited from std::integral_constant

    Member constants

    value
    [static]
    		 true if R1::num == R2::num && R1::den == R2::den, false otherwise
    (public static member constant)

    Member functions

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

    Member types

    Type Definition
    value_type bool
    type std::integral_constant<bool, value>

    Possible implementation

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

    Example

    Run this code
    #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: 

    2/3 == 6/9

    See also

    (C++11)
    		 compares two ratio objects for inequality at compile-time
    (class template) [edit]