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| author | John McCall <rjmccall@apple.com> | 2011-07-13 23:15:32 +0000 |
|---|---|---|
| committer | John McCall <rjmccall@apple.com> | 2011-07-13 23:15:32 +0000 |
| commit | 4f264950e51ef1e41ada0f6a3a25197cd141b571 (patch) | |
| tree | 88e70651777816b7abeec78391989837b0062a79 /docs/AutomaticReferenceCounting.html | |
| parent | 87c1f1f7c400deb2eb40d4599a40006072fb948c (diff) | |
Document the behavior of property modifiers in ARC.
rdar://problem/9768338
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@135104 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'docs/AutomaticReferenceCounting.html')
| -rw-r--r-- | docs/AutomaticReferenceCounting.html | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/docs/AutomaticReferenceCounting.html b/docs/AutomaticReferenceCounting.html index 244f9e6a1f..5090fa2b79 100644 --- a/docs/AutomaticReferenceCounting.html +++ b/docs/AutomaticReferenceCounting.html @@ -686,6 +686,43 @@ type.</p> <p>If an ownership qualifier appears anywhere else in a declarator, it applies to the type there.</p> +<div id="ownership.spelling.property"> +<h1>Property declarations</h1> + +<p>A property of retainable object pointer type may have ownership. +If the property's type is ownership-qualified, then the property has +that ownership. If the property has one of the following modifiers, +then the property has the corresponding ownership. A property is +ill-formed if it has conflicting sources of ownership, or if it has +redundant ownership modifiers, or if it has <tt>__autoreleasing</tt> +ownership.</p> + +<ul> +<li><tt>assign</tt> implies <tt>__unsafe_unretained</tt> ownership.</li> +<li><tt>copy</tt> implies <tt>__strong</tt> ownership, as well as the + usual behavior of copy semantics on the setter.</li> +<li><tt>retain</tt> implies <tt>__strong</tt> ownership.</li> +<li><tt>strong</tt> implies <tt>__strong</tt> ownership.</li> +<li><tt>unsafe_unretained</tt> implies <tt>__unsafe_unretained</tt> + ownership.</li> +<li><tt>weak</tt> implies <tt>__weak</tt> ownership.</li> +</ul> + +<p>With the exception of <tt>weak</tt>, these modifiers are available +in non-ARC modes.</p> + +<p>A property's specified ownership is preserved in its metadata, but +otherwise the meaning is purely conventional unless the property is +synthesized. If a property is synthesized, then the +<span class="term">associated instance variable</span> is the +instance variable which is named, possibly implicitly, by the +<tt>@synthesize</tt> declaration. If the associated instance variable +already exists, then its ownership qualification must equal the +ownership of the property; otherwise, the instance variable is created +with that ownership qualification.</p> + +</div> <!-- ownership.spelling.property --> + </div> <!-- ownership.spelling --> <div id="ownership.semantics"> |