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std::ratio_equal(3) C++ Standard Libary std::ratio_equal(3) NAME std::ratio_equal - std::ratio_equal Synopsis Defined in header <ratio> template< class R1, class R2 > struct ratio_equal : std::integral_constant<bool, /* see below */> { (since C++11) }; 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 [static] (public static member constant) Member functions operator bool converts the object to bool, returns value (public member function) operator() returns value (C++14) (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<4,6>>; std::cout << "2/3 " << (equ ? "==" : "!=") << " 4/6\n"; } Output: 2/3 == 4/6 See also http://cppreference.com 2022.07.31 std::ratio_equal(3)
NAME | Synopsis | Member constants | Member functions | Member types | Possible implementation | Example | Output: | See also
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