42 lines
1.3 KiB
C++
42 lines
1.3 KiB
C++
#include <stdexcept>
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#include <sstream>
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#include <iostream>
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#include <boost/safe_numerics/safe_integer.hpp>
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int main(int, const char *[]){
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// problem: checking of externally produced value can be overlooked
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std::cout << "example 6: ";
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std::cout << "checking of externally produced value can be overlooked" << std::endl;
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std::cout << "Not using safe numerics" << std::endl;
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std::istringstream is("12317289372189 1231287389217389217893");
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try{
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int x, y;
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is >> x >> y; // get integer values from the user
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std::cout << x << ' ' << y << std::endl;
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std::cout << "error NOT detected!" << std::endl;
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}
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catch(const std::exception &){
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std::cout << "error detected!" << std::endl;
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}
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// solution: assign externally retrieved values to safe equivalents
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std::cout << "Using safe numerics" << std::endl;
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{
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using namespace boost::safe_numerics;
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safe<int> x, y;
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is.seekg(0);
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try{
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is >> x >> y; // get integer values from the user
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std::cout << x << ' ' << y << std::endl;
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std::cout << "error NOT detected!" << std::endl;
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}
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catch(const std::exception & e){
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std::cout << "error detected:" << e.what() << std::endl;
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}
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}
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return 0;
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}
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