Author: Armin Rigo <ar...@tunes.org>
Branch:
Changeset: r1378:f37a06c4c060
Date: 2013-10-21 14:31 +0200
http://bitbucket.org/cffi/cffi/changeset/f37a06c4c060/
Log: Document the workaround for taking pointers to functions.
diff --git a/doc/source/index.rst b/doc/source/index.rst
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -981,6 +981,17 @@
Aside from these limitations, functions and callbacks can return structs.
+CPython only: for performance, ``ffi.verify()`` returns functions as
+objects of type ``<built-in function>``. They are not ``<cdata>``, so
+you cannot e.g. pass them to some other C function expecting a function
+pointer argument. Only ``ffi.typeof()`` works on them. If you really
+need a pointer to the function, use the following workaround::
+
+ ffi.cdef(""" int (*foo)(int a, int b); """)
+
+i.e. declare them as pointer-to-function in the cdef (even if they are
+regular functions in the C code).
+
Variadic function calls
-----------------------
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