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The Ripple protocol represent transfer rates and trust line qualities as fractions of one billion. For example, a transfer rate of 1% is represented as 1010000000. Previously, such rates where represented either as std::uint32_t or std::uint64_t. Other, nominally related types, also used an integral representation and could be unintentionally substituted. The new Rate class addresses this by providing a simple, type safe alternative which also helps make the code self-documenting since arithmetic operations now can be clearly understood to involve the scaling of an amount by a rate.
146 lines
3.0 KiB
C++
146 lines
3.0 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) 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 <BeastConfig.h>
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#include <ripple/protocol/Quality.h>
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#include <ripple/protocol/Rate.h>
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namespace ripple {
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Rate const parityRate (QUALITY_ONE);
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namespace detail {
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STAmount as_amount (Rate const& rate)
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{
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return { noIssue(), rate.value, -9, false };
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}
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}
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STAmount
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multiply (
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STAmount const& amount,
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Rate const& rate)
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{
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assert (rate.value != 0);
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if (rate == parityRate)
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return amount;
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return multiply (
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amount,
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detail::as_amount(rate),
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amount.issue());
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}
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STAmount
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multiplyRound (
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STAmount const& amount,
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Rate const& rate,
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bool roundUp)
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{
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assert (rate.value != 0);
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if (rate == parityRate)
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return amount;
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return mulRound (
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amount,
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detail::as_amount(rate),
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amount.issue(),
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roundUp);
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}
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STAmount
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multiplyRound (
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STAmount const& amount,
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Rate const& rate,
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Issue const& issue,
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bool roundUp)
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{
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assert (rate.value != 0);
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if (rate == parityRate)
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{
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return amount;
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}
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return mulRound (
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amount,
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detail::as_amount(rate),
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issue,
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roundUp);
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}
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STAmount
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divide (
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STAmount const& amount,
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Rate const& rate)
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{
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assert (rate.value != 0);
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if (rate == parityRate)
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return amount;
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return divide (
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amount,
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detail::as_amount(rate),
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amount.issue());
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}
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STAmount
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divideRound (
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STAmount const& amount,
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Rate const& rate,
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bool roundUp)
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{
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assert (rate.value != 0);
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if (rate == parityRate)
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return amount;
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return divRound (
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amount,
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detail::as_amount(rate),
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amount.issue(),
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roundUp);
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}
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STAmount
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divideRound (
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STAmount const& amount,
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Rate const& rate,
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Issue const& issue,
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bool roundUp)
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{
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assert (rate.value != 0);
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if (rate == parityRate)
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return amount;
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return divRound (
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amount,
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detail::as_amount(rate),
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issue,
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roundUp);
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}
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}
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