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111 lines
3.1 KiB
C++
111 lines
3.1 KiB
C++
#ifndef BOOST_NUMERIC_NATIVE_HPP
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#define BOOST_NUMERIC_NATIVE_HPP
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// Copyright (c) 2012 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 <type_traits>
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#include <limits>
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// policy which creates results types and values equal to that of C++ promotions.
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// When used in conjunction with a desired exception policy, traps errors but
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// does not otherwise alter the results produced by the program using it.
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namespace boost {
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namespace safe_numerics {
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struct native {
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public:
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// arithmetic operators
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template<typename T, typename U>
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struct addition_result {
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using type = decltype(
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typename base_type<T>::type()
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+ typename base_type<U>::type()
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);
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};
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template<typename T, typename U>
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struct subtraction_result {
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using type = decltype(
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typename base_type<T>::type()
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- typename base_type<U>::type()
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);
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};
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template<typename T, typename U>
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struct multiplication_result {
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using type = decltype(
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typename base_type<T>::type()
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* typename base_type<U>::type()
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);
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};
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template<typename T, typename U>
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struct division_result {
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using type = decltype(
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typename base_type<T>::type()
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/ typename base_type<U>::type()
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);
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};
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template<typename T, typename U>
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struct modulus_result {
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using type = decltype(
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typename base_type<T>::type()
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% typename base_type<U>::type()
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);
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};
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// note: comparison_result (<, >, ...) is special.
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// The return value is always a bool. The type returned here is
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// the intermediate type applied to make the values comparable.
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template<typename T, typename U>
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struct comparison_result {
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using type = decltype(
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typename base_type<T>::type()
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+ typename base_type<U>::type()
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);
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};
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// shift operators
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template<typename T, typename U>
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struct left_shift_result {
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using type = decltype(
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typename base_type<T>::type()
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<< typename base_type<U>::type()
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);
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};
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template<typename T, typename U>
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struct right_shift_result {
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using type = decltype(
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typename base_type<T>::type()
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>> typename base_type<U>::type()
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);
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};
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// bitwise operators
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template<typename T, typename U>
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struct bitwise_or_result {
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using type = decltype(
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typename base_type<T>::type()
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| typename base_type<U>::type()
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);
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};
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template<typename T, typename U>
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struct bitwise_and_result {
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using type = decltype(
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typename base_type<T>::type()
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& typename base_type<U>::type()
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);
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};
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template<typename T, typename U>
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struct bitwise_xor_result {
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using type = decltype(
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typename base_type<T>::type()
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^ typename base_type<U>::type()
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);
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};
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};
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} // safe_numerics
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} // boost
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#endif // BOOST_NUMERIC_NATIVE_HPP
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