| 1 | // Copyright (c) 2018 Robert Ramey |
|---|---|
| 2 | // |
| 3 | // Distributed under the Boost Software License, Version 1.0. (See |
| 4 | // accompanying file LICENSE_1_0.txt or copy at |
| 5 | // http://www.boost.org/LICENSE_1_0.txt) |
| 6 | |
| 7 | #include <stdexcept> |
| 8 | #include <sstream> |
| 9 | #include <iostream> |
| 10 | |
| 11 | #include <boost/safe_numerics/safe_integer.hpp> |
| 12 | |
| 13 | int main(int, const char *[]){ |
| 14 | // problem: checking of externally produced value can be overlooked |
| 15 | std::cout << "example 6: "; |
| 16 | std::cout << "checking of externally produced value can be overlooked"<< std::endl; |
| 17 | std::cout << "Not using safe numerics"<< std::endl; |
| 18 | |
| 19 | std::istringstream is("12317289372189 1231287389217389217893"); |
| 20 | |
| 21 | try{ |
| 22 | int x, y; |
| 23 | is >> x >> y; // get integer values from the user |
| 24 | std::cout << x << ' ' << y << std::endl; |
| 25 | std::cout << "error NOT detected!"<< std::endl; |
| 26 | } |
| 27 | catch(const std::exception &){ |
| 28 | std::cout << "error detected!"<< std::endl; |
| 29 | } |
| 30 | |
| 31 | // solution: assign externally retrieved values to safe equivalents |
| 32 | std::cout << "Using safe numerics"<< std::endl; |
| 33 | { |
| 34 | using namespace boost::safe_numerics; |
| 35 | safe<int> x, y; |
| 36 | is.seekg(0); |
| 37 | try{ |
| 38 | is >> x >> y; // get integer values from the user |
| 39 | std::cout << x << ' ' << y << std::endl; |
| 40 | std::cout << "error NOT detected!"<< std::endl; |
| 41 | } |
| 42 | catch(const std::exception & e){ |
| 43 | std::cout << "error detected:"<< e.what() << std::endl; |
| 44 | } |
| 45 | } |
| 46 | return 0; |
| 47 | } |
| 48 |