[LLVMbugs] [Bug 17980] New: Container<Incomplete Type> support

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17980

            Bug ID: 17980
           Summary: Container<Incomplete Type> support
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: hhinnant at apple.com
          Reporter: lichray at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Although not required by the standard (yet), allow value types
to be incomplete types can be very useful when declraing recursive
data structures:

  struct A {
    std::vector<A> v;
  };

Comparing to libstdc++, currently

  forward_list<Incomplete>

and

  deque<Incomplete>

are not supported by libc++.

Here are the proposed changes:

http://lists.cs.uiuc.edu/pipermail/cfe-dev/2013-November/033494.html
http://lists.cs.uiuc.edu/pipermail/cfe-dev/2013-November/033517.html

The later one requires probably an ABI immigration.  We don't know what to do
yet.

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