std::ratio_less_equal

< cpp‎ | numeric‎ | ratio
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 >
inline 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 <ratio>
#include <iostream>
 
auto main() -> int
{
    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";
    }
 
    // Since C++17
    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

See also