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template< class R1, class R2 > struct ratio_less : std::integral_constant;
R1 , R2, value true. , value false.
:
If the ratio R1 is less than the ratio R2, provides the member constant value equal true. Otherwise, value is false.
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std::integral_constant

value
[static]
 true, R1::num * R2::den < R2::num * R1::den, or equivalent expression that avoids overflow , false
(public static -)

-

operator bool
 bool, value
(public -)
operator()
(C++14)
 value
(public -)

value_type bool
type std::integral_constant<bool, value> 

#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";
    }
}

: 

23/37 < 57/90
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