Gerrit0 opened a new pull request, #2927:
URL: https://github.com/apache/avro/pull/2927
## What is the purpose of the change
I have a schema which contains a few empty records within a union to
describe operations which don't require options (other records in the union do
have fields). When generating code from the avro schema for an empty record
like the following:
```json
{
"type": "record",
"name": "Empty",
"fields": []
}
```
avrogencpp creates:
```cpp
template<> struct codec_traits<empty::Empty> {
static void encode(Encoder& e, const empty::Empty& v) {
}
static void decode(Decoder& d, empty::Empty& v) {
if (avro::ResolvingDecoder *rd =
dynamic_cast<avro::ResolvingDecoder *>(&d)) {
const std::vector<size_t> fo = rd->fieldOrder();
for (std::vector<size_t>::const_iterator it = fo.begin();
it != fo.end(); ++it) {
switch (*it) {
default:
break;
}
}
} else {
}
}
};
```
In a project with compiler warnings turned up, this generates compiler
warnings for unused parameters (GCC's `-Wunused-parameter`, MSVC's C4100) and
also for the switch with a default case but no other cases (some MSVC option
that I don't have in front of me right now).
With this change, we instead generate the following, which compiles cleanly:
```cpp
template<> struct codec_traits<empty::Empty> {
static void encode(Encoder&, const empty::Empty&) {}
static void decode(Decoder&, empty::Empty&) {}
};
```
## Verifying this change
This change is already covered by existing tests, the
[empty_record](https://github.com/apache/avro/blob/main/lang/c%2B%2B/jsonschemas/empty_record)
schema is compiled as a part of building the C++ SDK, and continues to
compile, producing the output described above.
## Documentation
- Does this pull request introduce a new feature? No.
- If yes, how is the feature documented? N/A
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