Fix deprecated use of 0/NULL in faiss/python/python_callbacks.cpp + 1 #455

	name: update-doxygen
	on:
	push:
	branches:
	- main
	paths:
	- 'faiss/**'
	jobs:
	doxygen:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Set up Python
	uses: actions/setup-python@v2
	with:
	python-version: 3.8
	- name: Install dependencies
	run: \|
	sudo apt-get install -y doxygen
	python -m pip install --upgrade pip
	pip install breathe
	- name: Generate doxygen xml
	run: doxygen
	- name: Push changes
	run: \|
	git config --global user.email "$GITHUB_ACTOR@users.noreply.github.com"
	git config --global user.name "$GITHUB_ACTOR"
	mkdir ./tmp
	mv xml ./tmp/xml
	git fetch origin gh-pages
	git checkout gh-pages
	git rm -rf xml cpp_api
	mv ./tmp/xml ./xml
	breathe-apidoc -o cpp_api xml
	git add xml cpp_api
	if [ -n "$(git status --porcelain)" ]
	then
	git commit -m "Update API docs ($(git rev-parse --short main))."
	git push origin gh-pages
	fi

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