safe_numerics/test/test_modulus.hpp

#ifndef BOOST_TEST_MODULUS_HPP
#define BOOST_TEST_MODULUS_HPP

//  Copyright (c) 2015 Robert Ramey
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)

#include <iostream>
#include <exception>

#include "../include/safe_integer.hpp"

template<class T1, class T2>
bool test_modulus(
    T1 v1,
    T2 v2,
    const char *av1,
    const char *av2,
    char expected_result
){
    std::cout << "testing"<< std::endl;
    {
        safe_t<T1> t1 = v1;
        using result_type = decltype(t1 % v2);
        std::cout << "safe<" << av1 << "> % " << av2 << " -> ";
        static_assert(
            boost::numeric::is_safe<safe_t<T1> >::value,
            "safe_t not safe!"
        );
        static_assert(
            boost::numeric::is_safe<result_type>::value,
            "Expression failed to return safe type"
        );
        result_type result;
        try{
            result = t1 % v2;
            std::cout << std::hex << result << "(" << std::dec << result << ")"
            << std::endl;
            if(expected_result == 'x'){
                std::cout
                    << "failed to detect error in modulus "
                    << std::hex << result << "(" << std::dec << result << ")"
                    << " ! = "<< av1 << " % " << av2
                    << std::endl;
                try{
                    t1 % v2;
                }
                catch(std::exception){}
                return false;
            }
        }
        catch(std::exception e){
            std::cout << std::hex << result << "(" << std::dec << result << ")"
            << std::endl;
            if(expected_result == '.'){
                std::cout
                    << "erroneously detected error in modulus "
                    << std::hex << result << "(" << std::dec << result << ")"
                    << " == "<< av1 << " % " << av2
                    << std::endl;
                try{
                    t1 % v2;
                }
                catch(std::exception){}
                return false;
            }
        }
    }
    {
        safe_t<T2> t2 = v2;
        using result_type = decltype(v1 + t2);
        std::cout << av1 << " % " << "safe<" << av2 << "> -> ";
        static_assert(
            boost::numeric::is_safe<safe_t<T2> >::value,
            "safe_t not safe!"
        );
        static_assert(
            boost::numeric::is_safe<result_type>::value,
            "Expression failed to return safe type"
        );
        result_type result;

        try{
            result = v1 % t2;
            std::cout << std::hex << result << "(" << std::dec << result << ")"
            << std::endl;
            if(expected_result =='x'){
                std::cout
                    << "failed to detect error in modulus "
                    << std::hex << result << "(" << std::dec << result << ")"
                    << " ! = "<< av1 << " % " << av2
                    << std::endl;
                try{
                    v1 % t2;
                }
                catch(std::exception){}
                return false;
            }
        }
        catch(std::exception){
            std::cout << std::hex << result << "(" << std::dec << result << ")"
            << std::endl;
            if(expected_result != 'x'){
                std::cout
                    << "erroneously detected error in modulus "
                    << std::hex << result << "(" << std::dec << result << ")"
                    << " == "<< av1 << " % " << av2
                    << std::endl;
                try{
                    v1 % t2;
                }
                catch(std::exception){}
                return false;
            }
        }
    }
    {
        safe_t<T1> t1 = v1;
        safe_t<T2> t2 = v2;
        using result_type = decltype(t1 + t2);
        std::cout << "safe<" << av1 << "> % " << "safe<" << av2 << "> -> ";
        static_assert(
            boost::numeric::is_safe<result_type>::value,
            "Expression failed to return safe type"
        );
        result_type result;
        try{
            result = t1 % t2;
            std::cout << std::hex << result << "(" << std::dec << result << ")"
            << std::endl;
            if(expected_result != '.'){
                std::cout
                    << "failed to detect error in modulus "
                    << std::hex << result << "(" << std::dec << result << ")"
                    << " ! = "<< av1 << " % " << av2
                    << std::endl;
                try{
                    result = t1 % t2;
                }
                catch(std::exception){}
                return false;
            }
        }
        catch(std::exception){
            std::cout << std::hex << result << "(" << std::dec << result << ")"
            << std::endl;
            if(expected_result != 'x'){
                std::cout
                    << "erroneously detected error in modulus "
                    << std::hex << result << "(" << std::dec << result << ")"
                    << " == "<< av1 << " % " << av2
                    << std::endl;
                try{
                    t1 % t2;
                }
                catch(std::exception){}
                return false;
            }
        }
    }
    return true;
}

#endif // BOOST_TEST_MODULUS