# std::ratio_less

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< cpp‎ | numeric‎ | ratio

Defined in header `<ratio>` |  |
template< class R1, class R2 > struct ratio_less : std::integral_constant; |  | (since C++11)

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 > inline 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

Run this code

    #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

### See also

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