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33f4c92b61
- Refactor Number internals away from int64 to uint64 & a sign flag
- ctors and accessors use `rep`. Very few things expose
`internalrep`.
- An exception is "unchecked" and the new "normalized", which explicitly
take an internalrep. But with those special control flags, it's easier
to distinguish and control when they are used.
- For now, skip the larger mantissas in AMM transactions and tests
- Remove trailing zeros from scientific notation Number strings
- Update tests. This has the happy side effect of making some of the string
representations _more_ consistent between the small and large
mantissa ranges.
- Add semi-automatic rounding of STNumbers based on Asset types
- Create a new SField metadata enum, sMD_NeedsAsset, which indicates
the field should be associated with an Asset so it can be rounded.
- Add a new STTakesAsset intermediate class to handle the Asset
association to a derived ST class. Currently only used in STNumber,
but could be used by other types in the future.
- Add "associateAsset" which takes an SLE and an Asset, finds the
sMD_NeedsAsset fields, and associates the Asset to them. In the case
of STNumber, that both stores the Asset, and rounds the value
immediately.
- Transactors only need to add a call to associateAsset _after_ all of
the STNumbers have been set. Unfortunately, the inner workings of
STObject do not do the association correctly with uninitialized
fields.
- When serializing an STNumber that has an Asset, round it before
serializing.
- Add an override of roundToAsset, which rounds a Number value in place
to an Asset, but without any additional scale.
- Update and fix a bunch of Loan-related tests to accommodate the
expanded Number class.
---------
Co-authored-by: Vito <5780819+Tapanito@users.noreply.github.com>
105 lines
2.5 KiB
C++
105 lines
2.5 KiB
C++
#ifndef XRPL_PROTOCOL_STNUMBER_H_INCLUDED
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#define XRPL_PROTOCOL_STNUMBER_H_INCLUDED
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#include <xrpl/basics/CountedObject.h>
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#include <xrpl/basics/Number.h>
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#include <xrpl/protocol/STBase.h>
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#include <xrpl/protocol/STTakesAsset.h>
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#include <ostream>
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namespace xrpl {
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/**
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* A serializable number.
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*
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* This type is-a `Number`, and can be used everywhere that is accepted.
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* This type simply integrates `Number` with the serialization framework,
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* letting it be used for fields in ledger entries and transactions.
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* It is effectively an `STAmount` sans `Asset`:
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* it can represent a value of any token type (XRP, IOU, or MPT)
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* without paying the storage cost of duplicating asset information
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* that may be deduced from the context.
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*
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* STNumber derives from STTakesAsset, so that it can be associated with the
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* related Asset during transaction processing. Which asset is relevant depends
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* on the object and transaction. As of this writing, only Vault, LoanBroker,
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* and Loan objects use STNumber fields. All of those fields represent amounts
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* of the Vault's Asset, so they should be associated with the Vault's Asset.
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*
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* e.g.
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* associateAsset(*loanSle, asset);
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* associateAsset(*brokerSle, asset);
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* associateAsset(*vaultSle, asset);
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*/
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class STNumber : public STTakesAsset, public CountedObject<STNumber>
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{
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private:
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Number value_;
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public:
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using value_type = Number;
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STNumber() = default;
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explicit STNumber(SField const& field, Number const& value = Number());
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STNumber(SerialIter& sit, SField const& field);
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SerializedTypeID
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getSType() const override;
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std::string
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getText() const override;
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void
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add(Serializer& s) const override;
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Number const&
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value() const;
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void
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setValue(Number const& v);
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STNumber&
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operator=(Number const& rhs)
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{
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setValue(rhs);
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return *this;
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}
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bool
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isEquivalent(STBase const& t) const override;
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bool
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isDefault() const override;
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void
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associateAsset(Asset const& a) override;
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operator Number() const
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{
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return value_;
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}
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private:
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STBase*
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copy(std::size_t n, void* buf) const override;
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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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std::ostream&
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operator<<(std::ostream& out, STNumber const& rhs);
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struct NumberParts
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{
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std::uint64_t mantissa = 0;
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int exponent = 0;
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bool negative = false;
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};
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NumberParts
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partsFromString(std::string const& number);
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STNumber
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numberFromJson(SField const& field, Json::Value const& value);
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} // namespace xrpl
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#endif
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