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+PR_FREEIF
+=========
+
+Conditionally frees allocated memory.
+
+
+Syntax
+------
+
+.. code::
+
+   #include <prmem.h>
+
+   void PR_FREEIF(_ptr);
+
+
+Parameter
+~~~~~~~~~
+
+``_ptr``
+   The address of memory to be returned to the heap.
+
+
+Returns
+~~~~~~~
+
+Nothing.
+
+
+Description
+-----------
+
+This macro returns memory to the heap when ``_ptr`` is not ``NULL``. If
+``_ptr`` is ``NULL``, the macro has no effect.