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template< class R1, class R2 > using ratio_subtract = /* unspecified */;
std::ratio_subtract std::ratio R1 R2. std::ratio std::ratio<Num, Denom> Num == R1::num * R2::den - R2::num * R1::den Denom == R1::den * R2::den.
:
The template alias std::ratio_subtract denotes the result of subtracting two exact rational fractions represented by the std::ratio instances R1 and R2. The result a std::ratio instance std::ratio<Num, Denom> where Num == R1::num * R2::den - R2::num * R1::den and Denom == R1::den * R2::den.
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-

type std::ratio<num, den>

num
[static]
constexpr std::intmax_t sign(Num) * sign(Denom) * abs(Num) / gcd(Num, Denom)
:
constexpr value of type std::intmax_t equal to sign(Num) * sign(Denom) * abs(Num) / gcd(Num, Denom)
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(public static -)
den
[static]
constexpr std::intmax_t abs(Denom) / gcd(Num, Denom)
:
constexpr value of type std::intmax_t equal to abs(Denom) / gcd(Num, Denom)
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(public static -) 

#include <iostream>
#include <ratio>

int main()
{
    typedef std::ratio<2, 3> two_third;
    typedef std::ratio<1, 6> one_sixth;

    typedef std::ratio_subtract<two_third, one_sixth> diff;
    std::cout << "2/3 - 1/6 = " << diff::num << '/' << diff::den << '\n';
}

: 

2/3 - 1/6 = 1/2
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