Arena: Add Methods & Properties (#269)

Add some fundamental `Arena` methods and properties.

src/Base/Arena.cpp

@@ -11,7 +11,31 @@
 void init_Arena(py::module &m) {
     using namespace amrex;
 
-    py::class_< Arena >(m, "Arena");
+    py::class_< Arena >(m, "Arena")
+        .def_static("initialize", &Arena::Initialize)
+        .def_static("print_usage", &Arena::PrintUsage)
+        .def_static("print_usage_to_files", &Arena::PrintUsageToFiles,
+                    py::arg("filename"), py::arg("message"))
+        .def_static("finalize", &Arena::Finalize)
+
+        // these two can be true at the same time
+        .def_property_readonly("is_device_accessible", &Arena::isDeviceAccessible)
+        .def_property_readonly("is_host_accessible", &Arena::isHostAccessible)
+
+        // the next three are mutually exclusive
+        .def_property_readonly("is_managed", &Arena::isManaged)
+        .def_property_readonly("is_device", &Arena::isDevice)
+        .def_property_readonly("is_pinned", &Arena::isPinned)
+
+#ifdef AMREX_USE_GPU
+        .def_property_readonly("is_stream_ordered_arena", &Arena::isStreamOrderedArena)
+#endif
+
+        .def("has_free_device_memory", &Arena::hasFreeDeviceMemory,
+             py::arg("sz"),
+             "Does the device have enough free memory for allocating this "
+             "much memory? For CPU builds, this always return true.")
+    ;
 
     m.def("The_Arena", &The_Arena, py::return_value_policy::reference)
      .def("The_Async_Arena", &The_Async_Arena, py::return_value_policy::reference)