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48 lines
1.6 KiB
C++
48 lines
1.6 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of rippled: https://github.com/ripple/rippled
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Copyright (c) 2012-2015 Ripple Labs Inc.
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#include <ripple/basics/mulDiv.h>
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#include <ripple/basics/contract.h>
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#include <boost/multiprecision/cpp_int.hpp>
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#include <limits>
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#include <utility>
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namespace ripple
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{
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std::pair<bool, std::uint64_t>
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mulDiv(std::uint64_t value, std::uint64_t mul, std::uint64_t div)
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{
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using namespace boost::multiprecision;
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uint128_t result;
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result = multiply(result, value, mul);
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result /= div;
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auto const limit = std::numeric_limits<std::uint64_t>::max();
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if (result > limit)
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return { false, limit };
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return { true, static_cast<std::uint64_t>(result) };
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}
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} // ripple
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