1 files changed, 28 insertions, 0 deletions
diff --git a/bits/iscanonical.h b/bits/iscanonical.h
new file mode 100644
index 0000000..97eb736
--- /dev/null
+++ b/bits/iscanonical.h
@@ -0,0 +1,28 @@
+/* Define iscanonical macro.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _MATH_H
+# error "Never use <bits/iscanonical.h> directly; include <math.h> instead."
+#endif
+
+/* Return nonzero value if X is canonical.  By default, we only have
+   IEEE interchange binary formats, in which all values are canonical,
+   but the argument must still be converted to its semantic type for
+   any exceptions arising from the conversion, before being
+   discarded.  */
+#define iscanonical(x) ((void) (__typeof (x)) (x), 1)