mirror of
https://github.com/boostorg/safe_numerics.git
synced 2026-02-27 17:22:13 +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
53 lines
1.2 KiB
C++
53 lines
1.2 KiB
C++
#ifndef BOOST_NUMERIC_UTILITY_HPP
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#define BOOST_NUMERIC_UTILITY_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) 2015 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 <cstdint> // intmax_t, uintmax_t
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#include <algorithm>
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#include <boost/integer.hpp> // (u)int_t<>::least, exact
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namespace boost {
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namespace numeric {
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constexpr int ulog(boost::uintmax_t x){
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unsigned i = 0;
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for(; x > 0; ++i)
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x >>= 1;
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return i;
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}
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constexpr int log(std::intmax_t x){
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if(x < 0)
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x = ~x;
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return ulog(x) + 1;
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}
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template<
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std::intmax_t Min,
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std::intmax_t Max
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>
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using signed_stored_type = typename boost::int_t<
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std::max(log(Min), log(Max))
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>::least ;
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template<
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std::uintmax_t Min,
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std::uintmax_t Max
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>
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using unsigned_stored_type = typename boost::uint_t<
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std::max(ulog(Min), ulog(Max))
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>::least ;
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} // numeric
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} // boost
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#endif // BOOST_NUMERIC_UTILITY_HPP
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