43 lines
1.3 KiB
C++
43 lines
1.3 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 <iostream>
|
|
|
|
#include <boost/safe_numerics/safe_integer.hpp>
|
|
|
|
int main(int, const char *[]){
|
|
// problem: cannot recover from arithmetic errors
|
|
std::cout << "example 7: ";
|
|
std::cout << "cannot recover from arithmetic errors" << std::endl;
|
|
std::cout << "Not using safe numerics" << std::endl;
|
|
|
|
try{
|
|
// can't do this as it will crash the program with no
|
|
// opportunity for recovery - comment out for example
|
|
// int x = 1;
|
|
// int y = 0;
|
|
// std::cout << x / y;
|
|
std::cout << "error cannot be handled at runtime!" << std::endl;
|
|
}
|
|
catch(const std::exception &){
|
|
std::cout << "error handled at runtime!" << std::endl;
|
|
}
|
|
// solution: replace int with safe<int>
|
|
std::cout << "Using safe numerics" << std::endl;
|
|
try{
|
|
using namespace boost::safe_numerics;
|
|
const safe<int> x = 1;
|
|
const safe<int> y = 0;
|
|
std::cout << x / y;
|
|
std::cout << "error NOT detected!" << std::endl;
|
|
}
|
|
catch(const std::exception & e){
|
|
std::cout << "error handled at runtime!" << e.what() << std::endl;
|
|
}
|
|
return 0;
|
|
}
|