Namespaces
Variants

    std::ratio_less

    From cppreference.com
     
    C++
     
    Metaprogramming library
    Type traits
    Type categories
    (C++11)
    (C++11)(DR*)
    (C++11)
    (C++11)
    (C++11)
    (C++11)
    (C++11)
    (C++11)
    (C++11) 
    (C++11)
    (C++11)
    (C++11)
    (C++11)
    (C++11)  
    (C++11)
    (C++11)
    (C++11)
    (C++11)
    (C++11)
    (C++11)
    (C++11)
    Type properties
    (C++11)
    (C++11)
    (C++11)
    (C++11)
    (C++14)
    (C++11)
    (C++17)
    (C++23)
    (C++11)(deprecated in C++26)
    (C++11)
    (C++11)
    (C++11)(until C++20*)
    (C++11)(deprecated in C++20)
    (C++11)
    (C++11)
    (C++20)
    (C++20)
    (C++23)
    (C++17)
    Type trait constants
    (C++11)(C++17)(C++11)(C++11)
    Metafunctions
    (C++17)
    (C++17)
    (C++17)
    Supported operations
    Relationships and property queries
    Type modifications
    (C++11)(C++11)(C++11)
    (C++11)(C++11)(C++11)
    (C++11)
    (C++11)
    Type transformations
    (C++11)(deprecated in C++23)
    (C++11)(deprecated in C++23)
    (C++11)
    (C++20)
    (C++11)(until C++20*)(C++17)

    (C++11)
    (C++11)
    (C++20)
    (C++11)
    (C++20)
    (C++11)
    (C++17)
    Compile-time rational arithmetic
    Compile-time integer sequences
    (C++14)
     
    Compile time rational arithmetic
    (C++11)
    Arithmetic
    (C++11)
    (C++11)
    (C++11)
    (C++11)
    Comparison
    (C++11)
    (C++11)
    (C++11)
    (C++11)
    (C++11)
    (C++11)
     
    Defined in header <ratio>
    template< class R1, class R2 > struct ratio_less : std::integral_constant<bool, /* see below */> { };
    		 (since C++11)
    See More

    If the ratio R1 is less than 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_v = ratio_less<R1, R2>::value;
    		 (since C++17)
    [edit]

    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()
{
    using x = std::ratio<69, 90>;
    using y = std::ratio<70, 90>;

    if constexpr (std::ratio_less_v<x, y>)
        std::cout << x::num << '/' << x::den << " < "
                  << y::num << '/' << y::den << '\n';
}

    Output: 

    23/30 < 7/9

    See also

    (C++11)
    		 compares two ratio objects for greater than at compile-time
    (class template) [edit]