a06d9f7a69
added tests for check result < and == operations correct implementation of some checked result types added constexpr example
38 lines
1.2 KiB
C++
38 lines
1.2 KiB
C++
#include <stdexcept>
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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: cannot recover from arithmetic errors
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std::cout << "example 8: ";
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std::cout << "cannot detect compile time arithmetic errors" << std::endl;
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std::cout << "Not using safe numerics" << std::endl;
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try{
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const int x = 1;
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const int y = 0;
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// will emit warning at compile time
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// will leave an invalid result at runtime.
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std::cout << x / y; // will display "0"!
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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: replace int with safe<int>
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std::cout << "Using safe numerics" << std::endl;
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try{
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using namespace boost::safe_numerics;
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const safe<int> x = 1;
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const safe<int> y = 0;
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// constexpr const safe<int> z = x / y; // note constexpr here!
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std::cout << x / y; // error would be detected at runtime
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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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return 0;
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}
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