zsy056 opened a new pull request, #3292:
URL: https://github.com/apache/thrift/pull/3292
## Description
Adds `forward_setter` value to `moveable_types` option, generating perfect
forwarding setters for complex types while preserving traditional setters for
primitives. Also fixes missing `operator<` implementation that caused link
errors when structs are used as map keys.
### Generator Changes
**Forward Setter Generation**
(`compiler/cpp/src/thrift/generate/t_cpp_generator.cc`):
- Parse `moveable_types=forward_setter` option
- Complex types (strings, containers, structs) → template setters with
`std::forward<T_>`
- Primitive types → traditional const-ref setters
- Template implementations in `.tcc` file (auto-included in header)
- Legacy `moveable_types` behavior unchanged
### Testing
**Compiler Unit Tests** (`compiler/cpp/tests/cpp/`):
- New `test_forward_setter.thrift` fixture
- Dedicated `t_cpp_generator_forward_setter_tests.cc` (91 assertions, 9 test
cases)
- Verify `.tcc` generation and template implementations
**Integration Tests** (`test/cpp/src/`):
- `ForwardSetterTest.cpp` - validates lvalue/rvalue/temporary/literal
setters with move semantics
- `PrivateOptionalTest.cpp` - SFINAE + static_assert verify optional fields
are private
- `EnumClassTest.cpp` - type_traits + static_assert verify true enum class
semantics
### Build System
**CMakeLists.txt** (`test/cpp/`):
- Separate gen-cpp-{forward,private,enumclass} directories
**Makefile.am** (`test/cpp/`):
- Library targets for each option variant
- Proper `BUILT_SOURCES` dependencies
- Include path ordering: option-specific directory before standard `gen-cpp`
### Example
```cpp
// Generated with --gen cpp:moveable_types=forward_setter
struct TestStruct {
int32_t primitive_field;
std::string complex_field;
void __set_primitive_field(const int32_t val); // Traditional
template <typename T_>
void __set_complex_field(T_&& val); // Perfect forwarding
};
// In .tcc file:
template <typename T_>
void TestStruct::__set_complex_field(T_&& val) {
this->complex_field = ::std::forward<T_>(val);
__isset.complex_field = true;
}
```
- [ ] Did you create an [Apache
Jira](https://issues.apache.org/jira/projects/THRIFT/issues/) ticket?
([Request account here](https://selfserve.apache.org/jira-account.html), not
required for trivial changes)
- [ ] If a ticket exists: Does your pull request title follow the pattern
"THRIFT-NNNN: describe my issue"?
- [x] Did you squash your changes to a single commit? (not required, but
preferred)
- [x] Did you do your best to avoid breaking changes? If one was needed,
did you label the Jira ticket with "Breaking-Change"?
- [ ] If your change does not involve any code, include `[skip ci]` anywhere
in the commit message to free up build resources.
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
