How to implement a with statement

[HealthyPear]

I am developing Python bindings with pybind11 for a C++ project of which I am not the author.
Such project implements a File Data Format.

One of the classes I managed to expose to Python is the one that implements the File object.
The class' header looks something like this (among many other things),

  /// Open a disk file in the specified mode
  XCDFFile(const char *fileName,
           const char *mode)
  {

    Init();
    Open(fileName, mode);
  }
  XCDFFile()
  {

    Init();
  }

  ~XCDFFile()
  {

    // Close-on-destruction behavior prevents assignment/copy construction
    Close();
  }

I managed to do (among other things)

    py::class_<XCDFFile>(m, "File")
        .def(py::init<const char *, const char *>())
        [...]
        .def("__iter__", [](XCDFFile &self)
             { return &self; })
        .def("__enter__", [](XCDFFile &self)
             { return &self; })

But I don't know how __exit__should look like in this syntax.
Python docs say it should look like object.__exit__(self, exc_type, exc_value, traceback), but I don't know how to translate this into pybind11, hoping that the class I am trying to expose doesn't need to be modified.

With the solution above I indeed receive the following error,

TypeError                                 Traceback (most recent call last)
Input In [2], in <cell line: 1>()
----> 1 with File("test_file_for_pybindings.xcd", "r") as input_file:
      2     pass

TypeError: __exit__(): incompatible function arguments. The following argument types are supported:
    1. (self: xcdf.xcdf.File) -> None

Invoked with: <xcdf.xcdf.File object at 0x10f430330>, None, None, None

[HealthyPear]

It seems that

.def("__exit__", [&](XCDFFile &r, void *exc_type, void *exc_value, void *traceback)
             { r.Close();  });

does the job!

Even though there is a side-problem (but I am not sure if it's becasue how the C++ library has been designed):

This is now not doing exactly what I was expecting,

In [3]: with File("test_file_for_pybindings.xcd", "r") as input_file:
   ...:     print(input_file.is_open)
   ...:
True

In [4]: input_file.is_open
Out[4]: False

becasue I would expect the object input_file to be deleted....am I right?