54 lines
1.6 KiB
C++
54 lines
1.6 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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#include <boost/safe_numerics/safe_integer_range.hpp>
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#include <boost/safe_numerics/automatic.hpp>
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#include <boost/safe_numerics/exception.hpp>
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#include "safe_format.hpp" // prints out range and value of any type
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using namespace boost::safe_numerics;
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using safe_t = safe_signed_range<
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-24,
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82,
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automatic,
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loose_trap_policy
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>;
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// define variables used for input
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using input_safe_t = safe_signed_range<
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-24,
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82,
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automatic, // we don't need automatic in this case
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loose_exception_policy // assignment of out of range value should throw
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>;
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// function arguments can never be outside of limits
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auto f(const safe_t & x, const safe_t & y){
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auto z = x + y; // we know that this cannot fail
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std::cout << "z = " << safe_format(z) << std::endl;
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std::cout << "(x + y) = " << safe_format(x + y) << std::endl;
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std::cout << "(x - y) = " << safe_format(x - y) << std::endl;
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return z;
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}
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int main(int argc, const char * argv[]){
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std::cout << "example 84:\n";
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input_safe_t x, y;
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try{
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std::cout << "type in values in format x y:" << std::flush;
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std::cin >> x >> y; // read varibles, maybe throw exception
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}
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catch(const std::exception & e){
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// none of the above should trap. Mark failure if they do
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std::cout << e.what() << std::endl;
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return 1;
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}
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std::cout << "x" << safe_format(x) << std::endl;
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std::cout << "y" << safe_format(y) << std::endl;
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std::cout << safe_format(f(x, y)) << std::endl;
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return 0;
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}
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