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155fcdbcd0
Conflicts: src/ripple/app/TODO.md src/ripple/app/ledger/Ledger.h src/ripple/protocol/Protocol.h
384 lines
10 KiB
C++
384 lines
10 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, 2013 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_PROTOCOL_STAMOUNT_H_INCLUDED
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#define RIPPLE_PROTOCOL_STAMOUNT_H_INCLUDED
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#include <ripple/protocol/SField.h>
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#include <ripple/protocol/Serializer.h>
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#include <ripple/protocol/STBase.h>
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#include <ripple/protocol/Issue.h>
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#include <beast/cxx14/memory.h> // <memory>
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namespace ripple {
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// Internal form:
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// 1: If amount is zero, then value is zero and offset is -100
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// 2: Otherwise:
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// legal offset range is -96 to +80 inclusive
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// value range is 10^15 to (10^16 - 1) inclusive
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// amount = value * [10 ^ offset]
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// Wire form:
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// High 8 bits are (offset+142), legal range is, 80 to 22 inclusive
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// Low 56 bits are value, legal range is 10^15 to (10^16 - 1) inclusive
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class STAmount
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: public STBase
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{
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public:
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using mantissa_type = std::uint64_t;
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using exponent_type = int;
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using rep = std::pair <mantissa_type, exponent_type>;
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private:
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Issue mIssue;
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mantissa_type mValue;
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exponent_type mOffset;
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bool mIsNative; // A shorthand for isXRP(mIssue).
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bool mIsNegative;
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public:
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static const int cMinOffset = -96;
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static const int cMaxOffset = 80;
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// Maximum native value supported by the code
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static const std::uint64_t cMinValue = 1000000000000000ull;
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static const std::uint64_t cMaxValue = 9999999999999999ull;
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static const std::uint64_t cMaxNative = 9000000000000000000ull;
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// Max native value on network.
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static const std::uint64_t cMaxNativeN = 100000000000000000ull;
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static const std::uint64_t cNotNative = 0x8000000000000000ull;
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static const std::uint64_t cPosNative = 0x4000000000000000ull;
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static std::uint64_t const uRateOne;
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//--------------------------------------------------------------------------
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STAmount(SerialIter& sit, SField const& name);
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struct unchecked { };
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// Do not call canonicalize
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STAmount (SField const& name, Issue const& issue,
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mantissa_type mantissa, exponent_type exponent,
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bool native, bool negative, unchecked);
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STAmount (Issue const& issue,
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mantissa_type mantissa, exponent_type exponent,
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bool native, bool negative, unchecked);
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// Call canonicalize
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STAmount (SField const& name, Issue const& issue,
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mantissa_type mantissa, exponent_type exponent,
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bool native, bool negative);
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STAmount (SField const& name, std::int64_t mantissa);
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STAmount (SField const& name,
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std::uint64_t mantissa = 0, bool negative = false);
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STAmount (SField const& name, Issue const& issue,
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std::uint64_t mantissa = 0, int exponent = 0, bool negative = false);
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STAmount (std::uint64_t mantissa = 0, bool negative = false);
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STAmount (Issue const& issue, std::uint64_t mantissa = 0, int exponent = 0,
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bool negative = false);
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// VFALCO Is this needed when we have the previous signature?
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STAmount (Issue const& issue, std::uint32_t mantissa, int exponent = 0,
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bool negative = false);
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STAmount (Issue const& issue, std::int64_t mantissa, int exponent = 0);
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STAmount (Issue const& issue, int mantissa, int exponent = 0);
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STBase*
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copy (std::size_t n, void* buf) const override
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{
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return emplace(n, buf, *this);
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}
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STBase*
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move (std::size_t n, void* buf) override
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{
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return emplace(n, buf, std::move(*this));
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}
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//--------------------------------------------------------------------------
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private:
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static
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std::unique_ptr<STAmount>
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construct (SerialIter&, SField const& name);
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void set (std::int64_t v);
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void canonicalize();
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public:
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//--------------------------------------------------------------------------
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//
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// Observers
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//
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//--------------------------------------------------------------------------
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int exponent() const noexcept { return mOffset; }
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bool native() const noexcept { return mIsNative; }
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bool negative() const noexcept { return mIsNegative; }
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std::uint64_t mantissa() const noexcept { return mValue; }
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Issue const& issue() const { return mIssue; }
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// These three are deprecated
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Currency const& getCurrency() const { return mIssue.currency; }
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Account const& getIssuer() const { return mIssue.account; }
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int
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signum() const noexcept
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{
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return mValue ? (mIsNegative ? -1 : 1) : 0;
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}
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/** Returns a zero value with the same issuer and currency. */
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STAmount
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zeroed() const
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{
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// TODO(tom): what does this next comment mean here?
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// See https://ripplelabs.atlassian.net/browse/WC-1847?jql=
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return STAmount (mIssue);
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}
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void
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setJson (Json::Value&) const;
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//--------------------------------------------------------------------------
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//
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// Operators
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//
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//--------------------------------------------------------------------------
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explicit operator bool() const noexcept
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{
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return *this != zero;
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}
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STAmount& operator+= (STAmount const&);
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STAmount& operator-= (STAmount const&);
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STAmount& operator= (beast::Zero)
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{
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clear();
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return *this;
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}
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//--------------------------------------------------------------------------
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//
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// Modification
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//
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//--------------------------------------------------------------------------
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void negate()
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{
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if (*this != zero)
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mIsNegative = !mIsNegative;
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}
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void clear()
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{
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// The -100 is used to allow 0 to sort less than a small positive values
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// which have a negative exponent.
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mOffset = mIsNative ? 0 : -100;
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mValue = 0;
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mIsNegative = false;
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}
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// Zero while copying currency and issuer.
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void clear (STAmount const& saTmpl)
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{
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clear (saTmpl.mIssue);
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}
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void clear (Issue const& issue)
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{
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setIssue(issue);
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clear();
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}
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void setIssuer (Account const& uIssuer)
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{
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mIssue.account = uIssuer;
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setIssue(mIssue);
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}
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/** Set the Issue for this amount and update mIsNative. */
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void setIssue (Issue const& issue);
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//--------------------------------------------------------------------------
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//
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// STBase
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//
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//--------------------------------------------------------------------------
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SerializedTypeID
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getSType() const override
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{
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return STI_AMOUNT;
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}
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std::string
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getFullText() const override;
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std::string
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getText() const override;
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Json::Value
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getJson (int) const override;
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void
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add (Serializer& s) const override;
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bool
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isEquivalent (const STBase& t) const override;
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bool
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isDefault() const override
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{
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return (mValue == 0) && mIsNative;
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}
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};
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//------------------------------------------------------------------------------
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//
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// Creation
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//
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//------------------------------------------------------------------------------
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STAmount
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amountFromRate (std::uint64_t uRate);
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// VFALCO TODO The parameter type should be Quality not uint64_t
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STAmount
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amountFromQuality (std::uint64_t rate);
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STAmount
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amountFromString (Issue const& issue, std::string const& amount);
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STAmount
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amountFromJson (SField const& name, Json::Value const& v);
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bool
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amountFromJsonNoThrow (STAmount& result, Json::Value const& jvSource);
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//------------------------------------------------------------------------------
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//
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// Observers
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//
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//------------------------------------------------------------------------------
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inline
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bool
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isLegalNet (STAmount const& value)
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{
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return ! value.native() || (value.mantissa() <= STAmount::cMaxNativeN);
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}
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//------------------------------------------------------------------------------
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//
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// Operators
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//
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//------------------------------------------------------------------------------
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bool operator== (STAmount const& lhs, STAmount const& rhs);
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bool operator< (STAmount const& lhs, STAmount const& rhs);
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inline
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bool
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operator!= (STAmount const& lhs, STAmount const& rhs)
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{
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return !(lhs == rhs);
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}
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inline
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bool
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operator> (STAmount const& lhs, STAmount const& rhs)
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{
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return rhs < lhs;
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}
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inline
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bool
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operator<= (STAmount const& lhs, STAmount const& rhs)
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{
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return !(rhs < lhs);
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}
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inline
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bool
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operator>= (STAmount const& lhs, STAmount const& rhs)
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{
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return !(lhs < rhs);
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}
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STAmount operator- (STAmount const& value);
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//------------------------------------------------------------------------------
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//
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// Arithmetic
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//
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//------------------------------------------------------------------------------
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STAmount operator+ (STAmount const& v1, STAmount const& v2);
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STAmount operator- (STAmount const& v1, STAmount const& v2);
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STAmount
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divide (STAmount const& v1, STAmount const& v2, Issue const& issue);
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STAmount
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multiply (STAmount const& v1, STAmount const& v2, Issue const& issue);
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// multiply, or divide rounding result in specified direction
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STAmount
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mulRound (STAmount const& v1, STAmount const& v2,
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Issue const& issue, bool roundUp);
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STAmount
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divRound (STAmount const& v1, STAmount const& v2,
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Issue const& issue, bool roundUp);
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// Someone is offering X for Y, what is the rate?
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// Rate: smaller is better, the taker wants the most out: in/out
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// VFALCO TODO Return a Quality object
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std::uint64_t
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getRate (STAmount const& offerOut, STAmount const& offerIn);
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//------------------------------------------------------------------------------
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inline bool isXRP(STAmount const& amount)
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{
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return isXRP (amount.issue().currency);
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}
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// VFALCO TODO Make static member accessors for these in STAmount
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extern const STAmount saZero;
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extern const STAmount saOne;
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} // ripple
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#endif
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