--- /dev/null
+// ----------------------------------------------------------------------------
+// $Id$
+// ----------------------------------------------------------------------------
+// Public Domain C Library - http://pdclib.sourceforge.net
+// This code is Public Domain. Use, modify, and redistribute at will.
+// ----------------------------------------------------------------------------
+
+// ----------------------------------------------------------------------------
+// C++
+
+bool isunordered( float x, float y ) { /* TODO */ };
+bool isunordered( double x, double y ) { /* TODO */ };
+bool isunordered( long double x, long double y ) { /* TODO */ };