mirror of
https://github.com/boostorg/safe_numerics.git
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12f5843f90
More carefully defined the concepts. That is the concept of the library is now clear: Trap at either compile or runtime integer operations which yield a result which differs from the normal arithmetic result. Pending on this check in: a) only addition is fixed up so far b) uses BOOST_TYPEOF... rather than decltype(... - final decision sill pending. c) comments out some compile time checks which should be re-instated. d) fixed tests so that they actually work!
87 lines
2.3 KiB
C++
87 lines
2.3 KiB
C++
#ifndef BOOST_NUMERIC_SAFE_INTEGER_HPP
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#define BOOST_NUMERIC_SAFE_INTEGER_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 <boost/config.hpp> // BOOST_NOEXCEPT
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#include <boost/limits.hpp>
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#include <boost/integer_traits.hpp>
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#include <boost/mpl/if.hpp>
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#include "safe_range.hpp"
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#include "numeric.hpp"
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namespace boost {
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namespace numeric {
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namespace detail{
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template<class T>
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struct safe_integer_base {
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typedef typename boost::mpl::if_<
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boost::numeric::is_signed<T>,
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boost::numeric::safe_signed_range<
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static_cast<boost::intmax_t>(boost::integer_traits<T>::const_min),
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static_cast<boost::intmax_t>(boost::integer_traits<T>::const_max)
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>,
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boost::numeric::safe_unsigned_range<
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static_cast<boost::uintmax_t>(boost::integer_traits<T>::const_min),
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static_cast<boost::uintmax_t>(boost::integer_traits<T>::const_max)
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>
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>::type type;
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};
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} // detail
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template<class T>
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struct safe : public detail::safe_integer_base<T>::type {
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typedef typename detail::safe_integer_base<T>::type base_type;
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// verify that std::numeric_limits has been specialized for this type
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BOOST_STATIC_ASSERT_MSG(
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std::numeric_limits<T>::is_specialized,
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"std::numeric_limits<T> has not been specialized for this type"
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);
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// verify that T is an integer type
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BOOST_STATIC_ASSERT_MSG(
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std::numeric_limits<T>::is_integer,
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"T is not an integer type"
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);
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safe(){}
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template<class U>
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safe(const U & u) :
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detail::safe_integer_base<T>::type(u)
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{}
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};
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} // numeric
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} // boost
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namespace std {
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template<class T>
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class numeric_limits< boost::numeric::safe<T> > : public
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numeric_limits<T>
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{
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typedef boost::numeric::safe<T> SI;
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public:
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BOOST_STATIC_CONSTEXPR SI min() BOOST_NOEXCEPT { return numeric_limits<T>::min(); }
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BOOST_STATIC_CONSTEXPR SI max() BOOST_NOEXCEPT { return numeric_limits<T>::max(); }
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BOOST_STATIC_CONSTEXPR SI lowest() BOOST_NOEXCEPT { return numeric_limits<T>::min(); }
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};
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} // std
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#endif // BOOST_NUMERIC_SAFE_INTEGER_HPP
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