EricWF added a comment.
Add inline comment describing part of the change. Sorry about all the spam :S
================
Comment at: include/functional:1266
@@ -1265,2 +1265,3 @@
+ _LIBCPP_INLINE_VISIBILITY
typename __invoke_return0<type, _A0>::type
operator() (_A0& __a0) const {
----------------
This part of the change adds extra overloads in `mem_fn` so that the call
operator can accept rvalues and temporaries as input.
A template argument `Ax&` will bind to any cv-qualified lvalue. However it will
not bind to an rvalue. In order to accept an rvalue in C++03 we need to accept
it as `Ax const&`. Therefore we need to enumerate every possible combination
of const and non-const arguments for each `operator()(...)` function.
Unfortunately this solution isn't perfect. Non-const rvalues will be forwarded
as const by `__invoke(...)` and anything that required the values to be
non-const will not compile. However I think this is the best we can do.
This same change is made to `reference_wrapper`.
http://reviews.llvm.org/D11553
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