[C++] Support optional additional arguments for inline visit functions

[js8544]

Describe the enhancement requested

Sometimes we need extra arguments for the Visit function, the most common of which is output parameters to save the result. For now, we need to have a member variable and a member function to get the result:

class ExampleVisitor {
 public:
  template <typename T>
  Status Visit(const T& arr) {
    /// Do stuff and save result to output_;
    return Status::OK();
  }

  std::shared_ptr<Array> GetOutput() { return output_; }

 private:
  std::shared_ptr<Array> output_;
};

ExampleVisitor visitor;
RETURN_NOT_OK(VisitArrayInline(*arr, &visitor));
*output = visitor.GetOutput();

It will be more convenient to write a Visitor if the VisitArrayInline function supports additional args for the Visit method:

class ExampleVisitorWithArg {
 public:
  template <typename T>
  Status Visit(const T& arr, std::shared_ptr<Array>* output) {
    /// Do stuff and save result to output directly;
    return Status::OK();
  }
};

ExampleVisitorWithArg visitor;
RETURN_NOT_OK(VisitArrayInline(*arr, &visitor, &output));

Component(s)

C++

[pitrou]

Issue resolved by pull request 33608
#33608