[cfe-dev] [libc++][Bug] Using allocators with std::map

Furkan Usta via cfe-dev cfe-dev at lists.llvm.org
Sun Aug 7 06:21:28 PDT 2016

I guess, I've found 2 bugs. I am not sure whether I should send this 2
separate mails. It is my first time, sorry about that.

1-) Custom allocator with explicit copy constructor
Here is the non-working code:

My reasoning is, in map constructor

map(const allocator_type& __a)
        : __tree_(__a)

__a is an allocator with std::pair. However, __tree_ is instantiated
with __value_type. It requires copy construction which is explicit.

2-) operator=, propagate_on_container_copy_assignment

Code: http://melpon.org/wandbox/permlink/uPR3u5fYkUx2In4k

propagate_on_container_copy_assignment is true and comparison always
returns false. Thus, it should use this->allocator to deallocate and
other.allocator to allocate.

Although in the example it doesn't even allocate, I guess it is
because there is

some sort of caching system, in the code it does


__assign_multi(__t.begin(), __t.end());

Then caches the nodes to be deleted in __assign_multi, but allocator
already changes

in __copy_assign_alloc

If they are really bugs, should I still open an issue in bugzilla or
is this mail enough?
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