ENH: Create NA singleton file

1 files changed, 22 insertions, 0 deletions

diff --git a/numpy/core/src/multiarray/na_singleton.c b/numpy/core/src/multiarray/na_singleton.c
new file mode 100644
index 000000000..8ad2122d1
--- /dev/null
+++ b/numpy/core/src/multiarray/na_singleton.c
@@ -0,0 +1,22 @@
+/*
+ * This file implements the missing value NA singleton object for NumPy.
+ *
+ * Written by Mark Wiebe (mwwiebe@gmail.com)
+ * Copyright (c) 2011 by Enthought, Inc.
+ *
+ * See LICENSE.txt for the license.
+ */
+
+/*
+ * Initializes the numpy.NA singleton object. Just like None in CPython,
+ * the type of NA is not exposed, and there is no NpyNA_Check() function.
+ *
+ * Some behaviors of the NA singleton:
+ *   - np.NA(payload=None, dtype=None) creates a zero-dimensional
+ *     ndarray containing a single NA. If dtype is an NA dtype, it's
+ *     an ndarray without an NA mask, otherwise it does have an NA mask.
+ */
+NPY_NO_EXPORT void
+numpy_na_singleton_init()
+{
+}