In http://reviews.llvm.org/D10997#200672, @EricWF wrote:
> I don't think we need any changes in `__functional_03` because we don't
> provide bind in 03 :)
The changes in `__functional_03` apply to commented out code. I added those
just for the sake of completeness, although I doubt there will ever be an '03
`bind`. There'd be no harm in dropping them.
================
Comment at: include/functional:2188
@@ -2187,2 +2187,3 @@
<
is_convertible<typename __bind_return<_Fd, _Td, tuple<_Args&&...>
>::type,
+ result_type>::value || is_void<_Rp>::value,
----------------
EricWF wrote:
> We could probably save a bunch of SFINAE here by using `__lazy_or` and
> putting the `is_void` check first. However I'm not sure that could hide
> errors caused by not evaluating `__bind_return`. Thoughts?
IIUC, `__bind_return` is SFINAE-ing out on a resulting ill-formed INVOKE
expression. Strictly speaking I don't think it is required, but since it's
already there I'd rather be consistent.
http://reviews.llvm.org/D10997
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