48 lines
1.5 KiB
C++
48 lines
1.5 KiB
C++
// 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 <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;
|
|
}
|