safe_numerics/examples/example84.cpp

#include <stdexcept>
#include <iostream>

#include "../include/safe_range.hpp"
#include "../include/automatic.hpp"
#include "../include/exception.hpp"

#include "safe_format.hpp" // prints out range and value of any type

using namespace boost::numeric;

using safe_t = safe_signed_range<
    -24,
    82,
    automatic,
    trap_exception
>;

// define variables use for input
using input_safe_t = safe_signed_range<
    -24,
    82,
    automatic, // we don't need automatic in this case
    throw_exception // these variables need to
>;

// function arguments can never be outside of limits
auto f(const safe_t & x, const safe_t & y){
    auto z = x + y;  // we know that this cannot fail
    std::cout << "z = " << safe_format(z) << std::endl;
    std::cout << "(x + y) = " << safe_format(x + y) << std::endl;
    std::cout << "(x - y) = " << safe_format(x - y) << std::endl;
    return z;
}

int main(int argc, const char * argv[]){
    std::cout << "example 84:\n";
    input_safe_t x, y;
    try{
        std::cin >> x >> y; // read varibles, maybe throw exception
    }
    catch(const std::exception & e){
        // none of the above should trap. Mark failure if they do
        std::cout << e.what() << std::endl;
        return 1;
    }
    std::cout << "x" << safe_format(x) << std::endl;
    std::cout << "y" << safe_format(y) << std::endl;
    std::cout << safe_format(f(x, y)) << std::endl;
    return 0;
}