Switch pybind11 classes to smart holders

This is the recommended, but not-yet-default, holder for C++ classes.

Author: QuLogic

src/_backend_agg_wrapper.cpp

@@ -216,7 +216,7 @@ PyRendererAgg_draw_gouraud_triangles(RendererAgg *self,
 
 PYBIND11_MODULE(_backend_agg, m, py::mod_gil_not_used())
 {
-    py::class_<RendererAgg>(m, "RendererAgg", py::buffer_protocol())
+    py::classh<RendererAgg>(m, "RendererAgg", py::buffer_protocol())
         .def(py::init<unsigned int, unsigned int, double>(),
              "width"_a, "height"_a, "dpi"_a)
 
@@ -266,7 +266,7 @@ PYBIND11_MODULE(_backend_agg, m, py::mod_gil_not_used())
             return py::buffer_info(renderer->pixBuffer, shape, strides);
         });
 
-    py::class_<BufferRegion>(m, "BufferRegion", py::buffer_protocol())
+    py::classh<BufferRegion>(m, "BufferRegion", py::buffer_protocol())
         // BufferRegion is not constructible from Python, thus no py::init is added.
         .def("set_x", &PyBufferRegion_set_x)
         .def("set_y", &PyBufferRegion_set_y)

src/ft2font_wrapper.cpp

@@ -1548,7 +1548,7 @@ PYBIND11_MODULE(ft2font, m, py::mod_gil_not_used())
         .value("BOLD", StyleFlags::BOLD)
         .finalize();
 
-    py::class_<FT2Image>(m, "FT2Image", py::is_final(), py::buffer_protocol(),
+    py::classh<FT2Image>(m, "FT2Image", py::is_final(), py::buffer_protocol(),
                          PyFT2Image__doc__)
         .def(py::init(
                 [](double_or_<long> width, double_or_<long> height) {
@@ -1571,7 +1571,7 @@ PYBIND11_MODULE(ft2font, m, py::mod_gil_not_used())
             return py::buffer_info(self.get_buffer(), shape, strides);
         });
 
-    py::class_<PyGlyph>(m, "Glyph", py::is_final(), PyGlyph__doc__)
+    py::classh<PyGlyph>(m, "Glyph", py::is_final(), PyGlyph__doc__)
         .def(py::init<>([]() -> PyGlyph {
             // Glyph is not useful from Python, so mark it as not constructible.
             throw std::runtime_error("Glyph is not constructible");
@@ -1595,7 +1595,7 @@ PYBIND11_MODULE(ft2font, m, py::mod_gil_not_used())
         .def_property_readonly("bbox", &PyGlyph_get_bbox,
                                "The control box of the glyph.");
 
-    py::class_<PyFT2Font>(m, "FT2Font", py::is_final(), py::buffer_protocol(),
+    py::classh<PyFT2Font>(m, "FT2Font", py::is_final(), py::buffer_protocol(),
                           PyFT2Font__doc__)
         .def(py::init(&PyFT2Font_init),
              "filename"_a, "hinting_factor"_a=8, py::kw_only(),

src/tri/_tri_wrapper.cpp

@@ -4,7 +4,7 @@ using namespace pybind11::literals;
 
 PYBIND11_MODULE(_tri, m, py::mod_gil_not_used())
 {
-    py::class_<Triangulation>(m, "Triangulation", py::is_final())
+    py::classh<Triangulation>(m, "Triangulation", py::is_final())
         .def(py::init<const Triangulation::CoordinateArray&,
                       const Triangulation::CoordinateArray&,
                       const Triangulation::TriangleArray&,
@@ -31,7 +31,7 @@ PYBIND11_MODULE(_tri, m, py::mod_gil_not_used())
         .def("set_mask", &Triangulation::set_mask,
             "Set or clear the mask array.");
 
-    py::class_<TriContourGenerator>(m, "TriContourGenerator", py::is_final())
+    py::classh<TriContourGenerator>(m, "TriContourGenerator", py::is_final())
         .def(py::init<Triangulation&,
                       const TriContourGenerator::CoordinateArray&>(),
             "triangulation"_a,
@@ -44,7 +44,7 @@ PYBIND11_MODULE(_tri, m, py::mod_gil_not_used())
         .def("create_filled_contour", &TriContourGenerator::create_filled_contour,
             "Create and return a filled contour.");
 
-    py::class_<TrapezoidMapTriFinder>(m, "TrapezoidMapTriFinder", py::is_final())
+    py::classh<TrapezoidMapTriFinder>(m, "TrapezoidMapTriFinder", py::is_final())
         .def(py::init<Triangulation&>(),
             "triangulation"_a,
             "Create a new C++ TrapezoidMapTriFinder object.\n"