[PATCH] D33550: Make __wrap_iter constexpr

[Marshall Clow via Phabricator via cfe-commits]

mclow.lists created this revision.

`__wrap_iter` is an internal libc++ class that is used as an iterator type when (for some reason) we don't want to use raw pointers as an iterator.  It is the iterator type for `vector` and `string` (but not `array` - not sure why). If we used pointers, all the operations on the iterators would be constexpr.  With this patch, the corresponding operations on `__wrap_iter` are constexpr as well.

We'll have to do this when http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-active.html#2938 is adopted.

No tests, because all the interesting constructors of `__wrap_iter` are private, and only accessed through friend functions.
I have written tests (after making the appropriate ctors public) and they seem to work.


https://reviews.llvm.org/D33550

Files:
  include/algorithm
  include/iterator

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