mirror of
https://github.com/boostorg/safe_numerics.git
synced 2026-02-10 11:42:29 +00:00
1bc0b94e65
a) made trap_exception work b) updated manual and examples to show how to use library to eliminate runtime penalty c) added in safe_literal d) made corrections of various types
100 lines
2.5 KiB
C++
100 lines
2.5 KiB
C++
#ifndef BOOST_NUMERIC_NATIVE_HPP
|
|
#define BOOST_NUMERIC_NATIVE_HPP
|
|
|
|
// MS compatible compilers support #pragma once
|
|
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
|
|
# pragma once
|
|
#endif
|
|
|
|
// Copyright (c) 2012 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 <type_traits>
|
|
#include <limits>
|
|
|
|
#include "checked.hpp"
|
|
|
|
// policy which creates results types and values equal to that of C++ promotions.
|
|
// When used in conjunction with a desired exception policy, traps errors but
|
|
// does not otherwise alter the results produced by the program using it.
|
|
namespace boost {
|
|
namespace numeric {
|
|
|
|
struct native {
|
|
// Standard C++ type promotion for expressions doesn't depend
|
|
// on the operation being performed so we can just as well
|
|
// use any operation to determine it. We choose + for this
|
|
// purpose.
|
|
|
|
template<typename T, typename U>
|
|
using result_type =
|
|
decltype(
|
|
typename base_type<T>::type()
|
|
+ typename base_type<U>::type()
|
|
);
|
|
|
|
template<typename T, typename U>
|
|
struct addition_result {
|
|
using type = result_type<T, U>;
|
|
};
|
|
template<typename T, typename U>
|
|
struct subtraction_result {
|
|
using type = result_type<T, U>;
|
|
};
|
|
template<typename T, typename U>
|
|
struct multiplication_result {
|
|
using type = result_type<T, U>;
|
|
};
|
|
template<typename T, typename U>
|
|
struct division_result {
|
|
using type = result_type<T, U>;
|
|
};
|
|
|
|
// forward to correct divide implementation
|
|
template<class R, class T, class U>
|
|
checked_result<R>
|
|
static constexpr divide(
|
|
const T & t,
|
|
const U & u
|
|
){
|
|
return checked::divide<R>(t, u);
|
|
}
|
|
|
|
template<typename T, typename U>
|
|
struct modulus_result {
|
|
using type = result_type<T, U>;
|
|
};
|
|
|
|
// forward to correct modulus implementation
|
|
template<class R, class T, class U>
|
|
checked_result<R>
|
|
static constexpr modulus(
|
|
const T & t,
|
|
const U & u
|
|
){
|
|
return checked::modulus<R>(t, u);
|
|
}
|
|
|
|
template<typename T, typename U>
|
|
struct left_shift_result {
|
|
using type = result_type<T, U>;
|
|
};
|
|
template<typename T, typename U>
|
|
struct right_shift_result {
|
|
using type = result_type<T, U>;
|
|
};
|
|
|
|
template<typename T, typename U>
|
|
struct bitwise_result {
|
|
using type = result_type<T, U>;
|
|
};
|
|
};
|
|
|
|
} // numeric
|
|
} // boost
|
|
|
|
#endif // BOOST_NUMERIC_NATIVE_HPP
|