Expose some dtype/array attributes via NumPy C API

tests/test_numpy_array.cpp

@@ -0,0 +1,45 @@
+/*
+    tests/test_numpy_array.cpp -- test core array functionality
+
+    Copyright (c) 2016 Ivan Smirnov <i.s.smirnov@gmail.com>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+#include <pybind11/numpy.h>
+#include <pybind11/stl.h>
+
+test_initializer numpy_array([](py::module &m) {
+    m.def("get_arr_ndim", [](const py::array& arr) {
+        return arr.ndim();
+    });
+    m.def("get_arr_shape", [](const py::array& arr) {
+        return std::vector<size_t>(arr.shape(), arr.shape() + arr.ndim());
+    });
+    m.def("get_arr_shape", [](const py::array& arr, size_t dim) {
+        return arr.shape(dim);
+    });
+    m.def("get_arr_strides", [](const py::array& arr) {
+        return std::vector<size_t>(arr.strides(), arr.strides() + arr.ndim());
+    });
+    m.def("get_arr_strides", [](const py::array& arr, size_t dim) {
+        return arr.strides(dim);
+    });
+    m.def("get_arr_writeable", [](const py::array& arr) {
+        return arr.writeable();
+    });
+    m.def("get_arr_size", [](const py::array& arr) {
+        return arr.size();
+    });
+    m.def("get_arr_itemsize", [](const py::array& arr) {
+        return arr.itemsize();
+    });
+    m.def("get_arr_nbytes", [](const py::array& arr) {
+        return arr.nbytes();
+    });
+    m.def("get_arr_owndata", [](const py::array& arr) {
+        return arr.owndata();
+    });
+});