boostorg/fusion — pull request #41 by Flast (2014-11-18 17:28:33+00:00)
Title: `result_of::at<Seq, N>::type` is't defined when sizeof of sequence is less than N

Split up from #39

- Fix Out-of-Bounds sequence acessing via at and at_c.
- `result_of::at_c, 2>::type` (and counterpart of `at`) doesn't occur hard error (static assert), but doesn't compile (SFINAE-friendly).
- IMO, SFINAE-friendly is better for consistency with any other `result_of` implementations.

close [#6507](https://svn.boost.org/trac/boost/ticket/6507), [#7651](https://svn.boost.org/trac/boost/ticket/7651)