This is a proposal (P0468) and reference implementation for an intrusive smart pointer for the C++ standard library. The example provided is fragile, as it is only being written against Python 3.5. More examples will eventually follow.
The implementation provided works with C++14, but could be backported to C++11. Due to the feature lockin of C++17, this will most likely not make it into the standard until C++20.
Creating the HTML file for the proposal requires rst2html.py, which is a part of the python docutils package.
The reference implementation (everything under the include directory) is under the BSD 2-clause.