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- #include <stdexcept>
- #include <iostream>
- #include <boost/safe_numerics/safe_integer.hpp>
- int main(int, const char *[]){
- // problem: cannot recover from arithmetic errors
- std::cout << "example 7: ";
- std::cout << "cannot recover from arithmetic errors" << std::endl;
- std::cout << "Not using safe numerics" << std::endl;
- try{
- int x = 1;
- int y = 0;
- // can't do this as it will crash the program with no
- // opportunity for recovery - comment out for example
- // std::cout << x / y;
- std::cout << "error cannot be handled at runtime!" << std::endl;
- }
- catch(const std::exception &){
- std::cout << "error handled at runtime!" << std::endl;
- }
- // solution: replace int with safe<int>
- std::cout << "Using safe numerics" << std::endl;
- try{
- using namespace boost::safe_numerics;
- const safe<int> x = 1;
- const safe<int> y = 0;
- std::cout << x / y;
- std::cout << "error NOT detected!" << std::endl;
- }
- catch(const std::exception & e){
- std::cout << "error handled at runtime!" << e.what() << std::endl;
- }
- return 0;
- }
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