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in ARC, under the usual reasoning limiting the use of __autoreleasing.

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last N months.  This required a brief soliloquy about change in
an uncertainly-versioned world.

I believe I've gotten the right target versions on all these changes.

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Introduce and document a new objc_returns_inner_pointer
attribute, and consume it by performing a retain+autorelease
on message receivers when they're not immediately loaded from
an object with precise lifetime.



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rdar://problem/9768338



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on class declarations. Documentation for // rdar://9693477


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attribute on property. Document for // rdar://9636091.


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where mismatched semantics can cause undefined behavior.



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specifying that retain/release/autorelease/retainCount are forbidden,
plus a section talking about the behavior of dealloc.



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silently dropped ownership qualifiers that were being applied to
ownership-qualified, substituted type that was *not* a substituted
template type parameter. We now provide a diagnostic in such cases,
and recover by dropping the added qualifiers.

Document this behavior in the ARC specification.


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ownership-unqualified retainable object type as __strong. This allows
us to write, e.g.,

  std::vector<id>

and we'll infer that the vector's element types have __strong
ownership semantics, which is far nicer than requiring:

  std::vector<__strong id>

Note that we allow one to override the ownership qualifier of a
substituted template type parameter, e.g., given

  template<typename T>
  struct X {
    typedef __weak T type;
  };

X<id> is treated the same as X<__strong id>. At instantiation type,
the __weak in "__weak T" overrides the (inferred or specified)
__strong on the template argument type, so that we can still provide
metaprogramming transformations.

This is part of <rdar://problem/9595486>.



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feature.

Implementation to follow. :)



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