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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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