r243350 - in /branches/gcc-5-branch/libstdc++-v...

[ville@gcc.gnu.org]

Author: ville
Date: Wed Dec  7 15:22:34 2016
New Revision: 243350

URL: https://gcc.gnu.org/viewcvs?rev=243350&root=gcc&view=rev
Log:
Backport from mainline
2016-12-06  Ville Voutilainen  <ville.voutilainen@gmail.com>

Constrain optional's __constexpr_addressof in its return type
and use a constexpr addressof for optional, if available.
* include/experimental/optional (__constexpr_addressof):
Constrain in the return type instead of in a template parameter.
(_Has_addressof_mem)
(_Has_addressof_free, _Has_addressof, __constexpr_addressof):
Guard with #ifndef __cpp_lib_addressof_constexpr.
(operator->()): Use std::__addressof if it's constexpr.

Modified:
    branches/gcc-5-branch/libstdc++-v3/ChangeLog
    branches/gcc-5-branch/libstdc++-v3/include/experimental/optional