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Support serialization as another type without casting

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This adds a READWRITEAS(type, obj) macro which serializes obj as if it
were casted to (const type&) when const, and to (type&) when non-const.

This makes it usable in serialization code that uses a single
implementation for both serialization and deserializing, which doesn't
know the constness of the object involved.
This commit is contained in:
Pieter Wuille 2017-07-07 16:06:56 -07:00
parent 8ee5c7b747
commit 818dc74ba2
7 changed files with 13 additions and 8 deletions
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2
src/addrman.h
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@ -59,7 +59,7 @@ public:
template <typename Stream, typename Operation>
inline void SerializationOp(Stream& s, Operation ser_action) {
READWRITE(*static_cast<CAddress*>(this));
READWRITEAS(CAddress, *this);
READWRITE(source);
READWRITE(nLastSuccess);
READWRITE(nAttempts);

2
src/primitives/block.h
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@ -93,7 +93,7 @@ public:
template <typename Stream, typename Operation>
inline void SerializationOp(Stream& s, Operation ser_action) {
READWRITE(*static_cast<CBlockHeader*>(this));
READWRITEAS(CBlockHeader, *this);
READWRITE(vtx);
}

2
src/protocol.h
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@ -349,7 +349,7 @@ public:
uint64_t nServicesInt = nServices;
READWRITE(nServicesInt);
nServices = static_cast<ServiceFlags>(nServicesInt);
READWRITE(*static_cast<CService*>(this));
READWRITEAS(CService, *this);
}
// TODO: make private (improves encapsulation)

2
src/script/script.h
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@ -415,7 +415,7 @@ public:
template <typename Stream, typename Operation>
inline void SerializationOp(Stream& s, Operation ser_action) {
READWRITE(static_cast<CScriptBase&>(*this));
READWRITEAS(CScriptBase, *this);
}
CScript& operator+=(const CScript& b)

7
src/serialize.h
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@ -148,7 +148,12 @@ enum
SER_GETHASH = (1 << 2),
};
#define READWRITE(...) (::SerReadWriteMany(s, ser_action, __VA_ARGS__))
//! Convert the reference base type to X, without changing constness or reference type.
template<typename X> X& ReadWriteAsHelper(X& x) { return x; }
template<typename X> const X& ReadWriteAsHelper(const X& x) { return x; }
#define READWRITE(...) (::SerReadWriteMany(s, ser_action, __VA_ARGS__))
#define READWRITEAS(type, obj) (::SerReadWriteMany(s, ser_action, ReadWriteAsHelper<type>(obj)))
/**
* Implement three methods for serializable objects. These are actually wrappers over

2
src/txdb.h
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@ -46,7 +46,7 @@ struct CDiskTxPos : public CDiskBlockPos
template <typename Stream, typename Operation>
inline void SerializationOp(Stream& s, Operation ser_action) {
READWRITE(*static_cast<CDiskBlockPos*>(this));
READWRITEAS(CDiskBlockPos, *this);
READWRITE(VARINT(nTxOffset));
}

4
src/wallet/wallet.h
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@ -395,7 +395,7 @@ public:
mapValueCopy["timesmart"] = strprintf("%u", nTimeSmart);
}
s << *static_cast<const CMerkleTx*>(this);
s << static_cast<const CMerkleTx&>(*this);
std::vector<CMerkleTx> vUnused; //!< Used to be vtxPrev
s << vUnused << mapValueCopy << vOrderForm << fTimeReceivedIsTxTime << nTimeReceived << fFromMe << fSpent;
}
@ -406,7 +406,7 @@ public:
Init(nullptr);
char fSpent;
s >> *static_cast<CMerkleTx*>(this);
s >> static_cast<CMerkleTx&>(*this);
std::vector<CMerkleTx> vUnused; //!< Used to be vtxPrev
s >> vUnused >> mapValue >> vOrderForm >> fTimeReceivedIsTxTime >> nTimeReceived >> fFromMe >> fSpent;