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- #include <iostream>
- #include <limits>
- #include <boost/rational.hpp>
- #include <boost/safe_numerics/safe_integer.hpp>
- int main(int, const char *[]){
- // simple demo of rational library
- const boost::rational<int> r {1, 2};
- std::cout << "r = " << r << std::endl;
- const boost::rational<int> q {-2, 4};
- std::cout << "q = " << q << std::endl;
- // display the product
- std::cout << "r * q = " << r * q << std::endl;
- // problem: rational doesn't handle integer overflow well
- const boost::rational<int> c {1, INT_MAX};
- std::cout << "c = " << c << std::endl;
- const boost::rational<int> d {1, 2};
- std::cout << "d = " << d << std::endl;
- // display the product - wrong answer
- std::cout << "c * d = " << c * d << std::endl;
- // solution: use safe integer in rational definition
- using safe_rational = boost::rational<
- boost::safe_numerics::safe<int>
- >;
- // use rationals created with safe_t
- const safe_rational sc {1, INT_MAX};
- std::cout << "c = " << sc << std::endl;
- const safe_rational sd {1, 2};
- std::cout << "d = " << sd << std::endl;
- std::cout << "c * d = ";
- try {
- // multiply them. This will overflow
- std::cout << sc * sd << std::endl;
- }
- catch (std::exception const& e) {
- // catch exception due to multiplication overflow
- std::cout << e.what() << std::endl;
- }
- return 0;
- }
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