add Matlab GHA workflow (with a struct-definition addition to the basic example)

.github/workflows/matlab.yml

@@ -0,0 +1,51 @@
+name: matlab
+
+defaults:
+  run:
+    shell: bash
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+
+
+jobs:
+  matlab:
+    runs-on: ubuntu-20.04
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: recursive
+
+      - uses: actions/setup-python@v1
+        with:
+          python-version: 3.8
+
+      - run: |
+          echo "CC=gcc-9" >> $GITHUB_ENV
+          echo "CXX=g++-9" >> $GITHUB_ENV
+          VERBOSE=1 pip install --verbose -e .
+
+      - run: |
+          echo "m = py.importlib.import_module('cmake_example')" > test.m
+          echo "AStruct = m.AStruct" >> test.m
+          echo "AStruct()" >> test.m
+          cat test.m
+
+      - run: python -c "import cmake_example as m; m.AStruct()"
+
+      #- run: |
+      #    echo "pybind11_type=type" > pybind11_builtins.py
+      #    echo "PYTHONPATH=." >> $GITHUB_ENV
+
+      - uses: matlab-actions/setup-matlab@v0
+        with:
+          release: R2022a
+
+      - uses: matlab-actions/run-command@v0
+        with:
+          command: test

src/main.cpp

@@ -7,6 +7,15 @@ int add(int i, int j) {
     return i + j;
 }
 
+struct AStruct {
+    AStruct() {
+    }
+};
+struct BStruct {
+    BStruct(AStruct &a) {
+    }
+};
+
 namespace py = pybind11;
 
 PYBIND11_MODULE(cmake_example, m) {
@@ -35,6 +44,11 @@ PYBIND11_MODULE(cmake_example, m) {
         Some other explanation about the subtract function.
     )pbdoc");
 
+    py::class_<AStruct>(m, "AStruct", py::metaclass((PyObject *) &PyType_Type)).def(py::init<>());
+    py::class_<BStruct>(m, "BStruct", py::metaclass((PyObject *) &PyType_Type)).def(py::init<AStruct&>());
+
+    m.def("fun", [](AStruct &a) { return 44; }, "doc", py::arg("a") );
+
 #ifdef VERSION_INFO
     m.attr("__version__") = MACRO_STRINGIFY(VERSION_INFO);
 #else

tests/test_basic.py

@@ -5,3 +5,8 @@ def test_main():
     assert m.__version__ == "0.0.1"
     assert m.add(1, 2) == 3
     assert m.subtract(1, 2) == -1
+
+    a = m.AStruct()
+    assert a is not None
+    m.fun(a)
+    b = m.BStruct(a)