id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
9112	[tr1] Failures in test_ref_wrapper_tricky.cpp	Petr Machata <pmachata@…>	Peter Dimov	"The mentioned test case gives a number of failures.  Those can be tracked down to two problems (at least the test case perceives them as problems).  Google gives hits dating this back to 1.37, I have confirmed it with 1.41 and 1.54.  I'm not sure why this hasn't been addressed--have I inadvertently opened a can of worms?

First, reference_wrapper that wraps function-like objects doesn't derive off std::unary_function, resp. std::binary function.  That's relatively easy to fix by introducing a reference_wrapper_base class template, that reference_wrapper inherits off.  That template optionally derives off unary_ or binary_function as appropriate.

Second, calling reference wrapper as function doesn't work for member functions.  This can be solved by introducing operator() in the above mentioned base class.

I'll attach a patch that implements the above, except for specializations for reference_wrapper<{binary,unary}_function>.  Please let me know whether a patch to this effect would be applicable and advise on areas that need more work."	Bugs	new	To Be Determined	result_of	Boost 1.54.0	Problem