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std::ratio_less

Defined in header `<ratio>`
template< class R1, class R2 > struct ratio_less : std::integral_constant;

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)

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()
{
    if (std::ratio_less<std::ratio<23,37>, std::ratio<57,90>>::value) {
        std::cout << "23/37 < 57/90\n";
    }
}

Output:

23/37 < 57/90