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          #include <boost/multiprecision/tommath.hpp>
        
namespace boost{ namespace multiprecision{ typedef rational_adpater<tommath_int> tommath_rational; typedef number<tommath_rational > tom_rational; }} // namespaces
          The tommath_rational back-end
          is used via the typedef boost::multiprecision::tom_rational.
          It acts as a thin wrapper around boost::rational<tom_int> to provide a rational number type that
          is a drop-in replacement for the native C++ number types, but with unlimited
          precision.
        
          The advantage of using this type rather than boost::rational<tom_int> directly, is that it is expression-template
          enabled, greatly reducing the number of temporaries created in complex
          expressions.
        
There are also non-member functions:
tom_int numerator(const tom_rational&); tom_int denominator(const tom_rational&);
which return the numerator and denominator of the number.
Things you should know when using this type:
tom_rationals
              have the value zero (this the inherited Boost.Rational behavior).
            std::overflow_error
              being thrown.
            std::runtime_error
              being thrown if the string can not be interpreted as a valid rational
              number.
            #include <boost/multiprecision/tommath.hpp> #include <iostream> int main() { using namespace boost::multiprecision; tom_rational v = 1; // Do some arithmetic: for(unsigned i = 1; i <= 1000; ++i) v *= i; v /= 10; std::cout << v << std::endl; // prints 1000! / 10 std::cout << numerator(v) << std::endl; std::cout << denominator(v) << std::endl; tom_rational w(2, 3); // Component wise constructor std::cout << w << std::endl; // prints 2/3 return 0; }