73 lines
2.1 KiB
C++
73 lines
2.1 KiB
C++
// Copyright (c) 2018 Robert Ramey
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#include <stdexcept>
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#include <iostream>
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#include <sstream>
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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/native.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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native,
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loose_exception_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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native, // 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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bool test(const char * test_string){
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std::istringstream sin(test_string);
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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:" << test_string << std::endl;
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sin >> 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() << '\n' << "input failure" << std::endl;
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return false;
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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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std::cout << "input success" << std::endl;
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return true;
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}
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int main(){
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std::cout << "example 84:\n";
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bool result =
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! test("123 125")
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&& test("0 0")
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&& test("-24 82")
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;
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std::cout << (result ? "Success!" : "Failure") << std::endl;
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return result ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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