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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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