diff options
Diffstat (limited to 'clang/docs/LanguageExtensions.html')
| -rw-r--r-- | clang/docs/LanguageExtensions.html | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/clang/docs/LanguageExtensions.html b/clang/docs/LanguageExtensions.html index b621eab311f..a7d8019f975 100644 --- a/clang/docs/LanguageExtensions.html +++ b/clang/docs/LanguageExtensions.html @@ -723,7 +723,19 @@ related result type. Similarly, the type of the expression <code>init</code> has a related result type and its receiver is known to have the type <code>NSArray *</code>. If neither <code>alloc</code> nor <code>init</code> had a related result type, the expressions would have had type <code>id</code>, as declared in the method signature.</p> -<p>To determine whether a method has a related result type, the first +<p>A method with a related result type can be declared by using the +type <tt>instancetype</tt> as its result type. <tt>instancetype</tt> +is a contextual keyword that is only permitted in the result type of +an Objective-C method, e.g.</p> + +<pre> +@interface A ++ (<b>instancetype</b>)constructAnA; +@end +</pre> + +<p>The related result type can also be inferred for some methods. +To determine whether a method has an inferred related result type, the first word in the camel-case selector (e.g., "init" in "initWithObjects") is considered, and the method will a related result type if its return type is compatible with the type of its class and if</p> @@ -752,8 +764,8 @@ with the subclass type. For example:</p> <p>Related result types only affect the type of a message send or property access via the given method. In all other respects, a method -with a related result type is treated the same way as method without a -related result type.</p> +with a related result type is treated the same way as method that +returns <tt>id</tt>.</p> <!-- ======================================================================= --> <h2 id="objc_arc">Automatic reference counting </h2> |
