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Build with C++20 as required by recent PyTorch headers #24

	name: Build (CPU)
	on:
	push:
	branches: [master, dev]
	pull_request:
	branches: [master, dev]

	jobs:
	build:
	strategy:
	fail-fast: false
	matrix:
	os:
	- ubuntu-latest
	- windows-latest
	- macos-latest
	version:
	- "3.9"
	- "3.10"
	- "3.11"
	- "3.12"
	runs-on: ${{ matrix.os }}
	steps:
	- name: Check out repository code
	uses: actions/checkout@v5
	- name: Setup Python
	uses: actions/setup-python@v6
	with:
	python-version: ${{ matrix.version }}
	- name: Install PyTorch (CPU)
	run: \|
	python -m pip install --upgrade pip
	python -m pip install numpy
	python -m pip install torch --index-url https://download.pytorch.org/whl/cpu
	- name: Install build dependencies
	run: python -m pip install scikit-build-core pybind11 cmake ninja
	- name: Build
	# Same command as documented in README: build against the PyTorch
	# installed above instead of an isolated build environment.
	run: pip install --no-build-isolation .
	- name: Import test
	# Run outside the repository root so the installed package is imported,
	# not the source directory.
	working-directory: ${{ runner.temp }}
	run: python -c "import torchmcubes; print(torchmcubes.__file__)"