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92f5a8d4 TL |
1 | #include <stdexcept> |
2 | #include <sstream> | |
3 | #include <iostream> | |
4 | ||
5 | #include <boost/safe_numerics/safe_integer.hpp> | |
6 | ||
7 | int main(int, const char *[]){ | |
8 | // problem: checking of externally produced value can be overlooked | |
9 | std::cout << "example 6: "; | |
10 | std::cout << "checking of externally produced value can be overlooked" << std::endl; | |
11 | std::cout << "Not using safe numerics" << std::endl; | |
12 | ||
13 | std::istringstream is("12317289372189 1231287389217389217893"); | |
14 | ||
15 | try{ | |
16 | int x, y; | |
17 | is >> x >> y; // get integer values from the user | |
18 | std::cout << x << ' ' << y << std::endl; | |
19 | std::cout << "error NOT detected!" << std::endl; | |
20 | } | |
21 | catch(const std::exception &){ | |
22 | std::cout << "error detected!" << std::endl; | |
23 | } | |
24 | ||
25 | // solution: assign externally retrieved values to safe equivalents | |
26 | std::cout << "Using safe numerics" << std::endl; | |
27 | { | |
28 | using namespace boost::safe_numerics; | |
29 | safe<int> x, y; | |
30 | is.seekg(0); | |
31 | try{ | |
32 | is >> x >> y; // get integer values from the user | |
33 | std::cout << x << ' ' << y << std::endl; | |
34 | std::cout << "error NOT detected!" << std::endl; | |
35 | } | |
36 | catch(const std::exception & e){ | |
37 | std::cout << "error detected:" << e.what() << std::endl; | |
38 | } | |
39 | } | |
40 | return 0; | |
41 | } |