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- #include <stdexcept>
- #include <sstream>
- #include <iostream>
- #include <boost/safe_numerics/safe_integer.hpp>
- int main(int, const char *[]){
- // problem: checking of externally produced value can be overlooked
- std::cout << "example 6: ";
- std::cout << "checking of externally produced value can be overlooked" << std::endl;
- std::cout << "Not using safe numerics" << std::endl;
- std::istringstream is("12317289372189 1231287389217389217893");
- try{
- int x, y;
- is >> x >> y; // get integer values from the user
- std::cout << x << ' ' << y << std::endl;
- std::cout << "error NOT detected!" << std::endl;
- }
- catch(const std::exception &){
- std::cout << "error detected!" << std::endl;
- }
- // solution: assign externally retrieved values to safe equivalents
- std::cout << "Using safe numerics" << std::endl;
- {
- using namespace boost::safe_numerics;
- safe<int> x, y;
- is.seekg(0);
- try{
- is >> x >> y; // get integer values from the user
- std::cout << x << ' ' << y << std::endl;
- std::cout << "error NOT detected!" << std::endl;
- }
- catch(const std::exception & e){
- std::cout << "error detected:" << e.what() << std::endl;
- }
- }
- return 0;
- }
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