[LLVMbugs] [Bug 20616] New: shared_ptr does not compile with fancy pointer allocators

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20616

            Bug ID: 20616
           Summary: shared_ptr does not compile with fancy pointer
                    allocators
           Product: libc++
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: tkoeppe at google.com
                CC: llvmbugs at cs.uiuc.edu, mclow.lists at gmail.com
    Classification: Unclassified

The implementation of allocate_shared currently assumes that
allocator_traits<_Alloc>::pointer is a native pointer, and thus doesn't compile
with fancy pointers.

I believe all that's needed is to replace "__hold2.get()" by
"_VSTD::addressof(*__hold2.get())" in a few places (e.g. memory:4289 and
memory:4292, maybe also for the _LIBCPP_HAS_NO_VARIADICS versions.

A few quick tests suggest that with those fixes you can use allocate_shared and
also the allocator constructor with fancy pointer allocators.

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