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0a5822c14d
(right now - only working in addition!) More examples More complete documentation pending issue - compile time trap
91 lines
2.9 KiB
C++
91 lines
2.9 KiB
C++
#ifndef BOOST_NUMERIC_NATIVE_HPP
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#define BOOST_NUMERIC_NATIVE_HPP
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// MS compatible compilers support #pragma once
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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# pragma once
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#endif
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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 numeric {
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// forward declaration - safe type
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template<
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class Stored,
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Stored Min,
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Stored Max,
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class P, // promotion polic
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class E // exception policy
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>
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class safe_base;
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struct native {
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// Standard C++ type promotion for expressions doesn't depend
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// on the operation being performed so we can just as well
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// use any operation to determine it. We choose + for this
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// purpose.
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template<typename T, typename U>
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using result_type = decltype(T() + U());
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template<typename T, typename U, typename P, typename E>
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struct safe_type_promotion {
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using base_type_t = typename base_type<T>::type;
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using base_type_u = typename base_type<U>::type;
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using result_base_type = result_type<base_type_t, base_type_u>;
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using type = safe_base<
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result_base_type,
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std::numeric_limits<result_base_type>::min(),
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std::numeric_limits<result_base_type>::max(),
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P,
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E
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>;
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};
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template<typename T, typename U, typename P, typename E>
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struct addition_result {
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typedef typename safe_type_promotion<T, U, P, E>::type type;
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};
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template<typename T, typename U, typename P, typename E>
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struct subtraction_result {
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typedef typename safe_type_promotion<T, U, P, E>::type type;
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};
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template<typename T, typename U, typename P, typename E>
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struct multiplication_result {
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typedef typename safe_type_promotion<T, U, P, E>::type type;
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};
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template<typename T, typename U, typename P, typename E>
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struct division_result {
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typedef typename safe_type_promotion<T, U, P, E>::type type;
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};
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template<typename T, typename U, typename P, typename E>
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struct modulus_result {
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typedef typename safe_type_promotion<T, U, P, E>::type type;
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};
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template<typename T, typename U, typename P, typename E>
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struct left_shift_result {
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typedef typename safe_type_promotion<T, U, P, E>::type type;
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};
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template<typename T, typename U, typename P, typename E>
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struct right_shift_result {
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typedef typename safe_type_promotion<T, U, P, E>::type type;
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};
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};
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} // numeric
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} // boost
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#endif // BOOST_NUMERIC_NATIVE_HPP
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