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Introduce new serialization macros without casts

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This new approach uses a static method which takes the object as
a argument. This has the advantage that its constness can be a
template parameter, allowing a single implementation that sees the
object as const for serialization and non-const for deserialization,
without casts.

More boilerplate is included in the new macro as well.
This commit is contained in:
Pieter Wuille 2017-07-07 15:48:13 -07:00
parent 3f8dbcd655
commit ca33451535
1 changed files with 24 additions and 0 deletions
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24
src/serialize.h
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@ -199,6 +199,30 @@ template<typename X> const X& ReadWriteAsHelper(const X& x) { return x; }
SerializationOp(s, CSerActionUnserialize()); \
}
/**
* Implement the Serialize and Unserialize methods by delegating to a single templated
* static method that takes the to-be-(de)serialized object as a parameter. This approach
* has the advantage that the constness of the object becomes a template parameter, and
* thus allows a single implementation that sees the object as const for serializing
* and non-const for deserializing, without casts.
*/
#define SERIALIZE_METHODS(cls, obj) \
template<typename Stream> \
void Serialize(Stream& s) const \
{ \
static_assert(std::is_same<const cls&, decltype(*this)>::value, "Serialize type mismatch"); \
SerializationOps(*this, s, CSerActionSerialize()); \
} \
template<typename Stream> \
void Unserialize(Stream& s) \
{ \
static_assert(std::is_same<cls&, decltype(*this)>::value, "Unserialize type mismatch"); \
SerializationOps(*this, s, CSerActionUnserialize()); \
} \
template<typename Stream, typename Type, typename Operation> \
static inline void SerializationOps(Type& obj, Stream& s, Operation ser_action) \
#ifndef CHAR_EQUALS_INT8
template<typename Stream> inline void Serialize(Stream& s, char a ) { ser_writedata8(s, a); } // TODO Get rid of bare char
#endif