std::ratio_less_equal

Defined in header `<ratio>`
template< class R1, class R2 > struct ratio_less_equal : std::integral_constant<bool, /* see below */> { };		(since C++11)

If the ratio R1 is less than or equal to the ratio R2, provides the member constant value equal true. Otherwise, value is false.

Helper variable template

template< class R1, class R2 >
constexpr bool ratio_less_equal_v = ratio_less_equal<R1, R2>::value;

(since C++17)

Inherited from std::integral_constant

Member constants

value

[static]

true if R1::num * R2::den <= R2::num * R1::den, or equivalent expression that avoids overflow, 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>

Example

#include <iostream>
#include <ratio>

int main()
{
    static_assert(std::ratio_less_equal<std::ratio<1, 2>, std::ratio<3, 4>>::value,
                  "1/2 <= 3/4");

    if (std::ratio_less_equal<std::ratio<10,11>, std::ratio<11,12>>::value)
        std::cout << "10/11 <= 11/12" "\n";

    static_assert(std::ratio_less_equal_v<std::ratio<10, 11>, std::ratio<11, 12>>);

    if constexpr (std::ratio_less_equal_v<std::ratio<10, 11>, std::ratio<11, 12>>)
        std::cout << "11/12 <= 12/13" "\n";
}

Output:

10/11 <= 11/12
11/12 <= 12/13

ratio_equal (C++11)	compares two `ratio` objects for equality at compile-time (class template)
ratio_not_equal (C++11)	compares two `ratio` objects for inequality at compile-time (class template)