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46 lines
1.7 KiB
C++
46 lines
1.7 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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#ifndef RIPPLE_BASICS_MULDIV_H_INCLUDED
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#define RIPPLE_BASICS_MULDIV_H_INCLUDED
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#include <cstdint>
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#include <limits>
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#include <optional>
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namespace ripple {
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auto constexpr muldiv_max = std::numeric_limits<std::uint64_t>::max();
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/** Return value*mul/div accurately.
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Computes the result of the multiplication and division in
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a single step, avoiding overflow and retaining precision.
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Throws:
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None
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Returns:
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`std::optional`:
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`std::nullopt` if the calculation overflows. Otherwise, `value * mul
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/ div`.
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*/
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std::optional<std::uint64_t>
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mulDiv(std::uint64_t value, std::uint64_t mul, std::uint64_t div);
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} // namespace ripple
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#endif
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