[PATCH] D34331: func.wrap.func.con: Unset function before destroying anything

[Duncan P. N. Exon Smith via Phabricator via cfe-commits]

dexonsmith created this revision.

Be defensive against a reentrant std::function::operator=(), in case the held function object has a non-trivial destructor.  Destroying the function object in-place can lead to the destructor being called twice.

rdar://problem/32836603


https://reviews.llvm.org/D34331

Files:
  libcxx/include/functional
  libcxx/test/libcxx/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/move_reentrant.pass.cpp
  libcxx/test/libcxx/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/nullptr_t_assign_reentrant.pass.cpp

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