std:: ratio_less_equal

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ratio_less_equal
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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

Run this code 
#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

See also

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