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External references for the object API thru a resolver function.

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This allows hashed string fields to be used for lookup of any
C++ objects, a pointer to which are then stored in the object
besides the original hash for easy access.

Change-Id: I2247a13c349b905f1c54660becde2c818ad23e97
Tested: on Linux.
Bug: 30204449
This commit is contained in:
Wouter van Oortmerssen
2016-10-05 16:59:15 -07:00
parent b2e55c556e
commit dc2fa215b8
10 changed files with 161 additions and 76 deletions
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21
tests/test.cpp
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@@ -314,17 +314,30 @@ void MutateFlatBuffersTest(uint8_t *flatbuf, std::size_t length) {
// Unpack a FlatBuffer into objects.
void ObjectFlatBuffersTest(uint8_t *flatbuf) {
// Optional: we can specify resolver and rehasher functions to turn hashed
// strings into object pointers and back, to implement remote references
// and such.
auto resolver = flatbuffers::resolver_function_t([](void **pointer_adr,
flatbuffers::hash_value_t hash) {
return nullptr; // Fail the lookup.
});
auto rehasher = flatbuffers::rehasher_function_t([](void *pointer) {
return 0;
});
// Turn a buffer into C++ objects.
auto monster1 = GetMonster(flatbuf)->UnPack();
auto monster1 = GetMonster(flatbuf)->UnPack(&resolver);
// Re-serialize the data.
flatbuffers::FlatBufferBuilder fbb1;
fbb1.Finish(CreateMonster(fbb1, monster1.get()), MonsterIdentifier());
fbb1.Finish(CreateMonster(fbb1, monster1.get(), &rehasher),
MonsterIdentifier());
// Unpack again, and re-serialize again.
auto monster2 = GetMonster(fbb1.GetBufferPointer())->UnPack();
auto monster2 = GetMonster(fbb1.GetBufferPointer())->UnPack(&resolver);
flatbuffers::FlatBufferBuilder fbb2;
fbb2.Finish(CreateMonster(fbb2, monster2.get()), MonsterIdentifier());
fbb2.Finish(CreateMonster(fbb2, monster2.get(), &rehasher),
MonsterIdentifier());
// Now we've gone full round-trip, the two buffers should match.
auto len1 = fbb1.GetSize();