Std::ratio_equal (3) Linux Manual Page

std::ratio_equal – std::ratio_equal

Synopsis

Defined in header<ratio>

    template <class R1, class R2>
    (since C++ 11)

        struct ratio_equal : std::integral_constant;

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 >                                     (since C++17)

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

Inherited from std::integral_constant

Member constants

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

Member functions

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

operator() returns value
(public member function)
(C++14)

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()

{
    if (std::ratio_equal<std::ratio<2, 3>, std::ratio<4, 6>>::value) {
        std::cout << "2/3 == 4/6\n";
    } else {
        std::cout << "2/3 != 4/6\n";
    }
}

Output:

2/3 == 4/6

std::ratio_equal (3) Linux Manual Page