12345678910111213141516171819202122232425262728293031323334353637383940 |
- // Copyright (c) 2018 Robert Ramey
- //
- // Distributed under the Boost Software License, Version 1.0. (See
- // accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt)
- #include <iostream>
- #include <boost/safe_numerics/safe_integer.hpp>
- int main(int, const char *[]){
- std::cout << "example 2:";
- std::cout << "undetected overflow in data type" << std::endl;
- // problem: undetected overflow
- std::cout << "Not using safe numerics" << std::endl;
- try{
- int x = INT_MAX;
- // the following silently produces an incorrect result
- ++x;
- std::cout << x << " != " << INT_MAX << " + 1" << std::endl;
- std::cout << "error NOT detected!" << std::endl;
- }
- catch(const std::exception &){
- std::cout << "error detected!" << std::endl;
- }
- // solution: replace int with safe<int>
- std::cout << "Using safe numerics" << std::endl;
- try{
- using namespace boost::safe_numerics;
- safe<int> x = INT_MAX;
- // throws exception when result is past maximum possible
- ++x;
- assert(false); // never arrive here
- }
- catch(const std::exception & e){
- std::cout << e.what() << std::endl;
- std::cout << "error detected!" << std::endl;
- }
- return 0;
- }
|