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Re: App hangs when displaying any sheet in 10.5 [SOLVED]
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Re: App hangs when displaying any sheet in 10.5 [SOLVED]


  • Subject: Re: App hangs when displaying any sheet in 10.5 [SOLVED]
  • From: j o a r <email@hidden>
  • Date: Fri, 6 Jun 2008 08:41:53 -0700


On Jun 5, 2008, at 10:26 PM, Graham Cox wrote:

I guess the question is, given an object type 'id', which method signature will the compiler go with? Does the return type affect the method signature? (In C++ it doesn't for example), so two methods:

- (CGPoint) position;
- (float)   position;

might well have identical signatures. The compiler doesn't have an object type to narrow it down, so which will it use - the first it finds maybe.


You might want to experiment with enabling one or more of the following optional warnings:

-Wselector
Warn if multiple methods of different types for the same selector are found during compilation. The check is performed on the list of methods in the final stage of compilation. Additionally, a check is performed for each selector appearing in a "@selector(...)" expression, and a corresponding method for that selector has been found during compilation. Because these checks scan the method table only at the end of compilation, these warnings are not produced if the final stage of compilation is not reached, for example because an error is found during compilation, or because the -fsyntax-only option is being used.
-Wstrict-selector-match
Warn if multiple methods with differing argument and/or return types are found for a given selector when attempting to send a message using this selector to a receiver of type "id" or "Class". When this flag is off (which is the default behavior), the compiler will omit such warnings if any differences found are confined to types which share the same size and alignment.
-Wundeclared-selector
Warn if a "@selector(...)" expression referring to an undeclared selector is found. A selector is considered undeclared if no method with that name has been declared before the "@selector(...)" expression, either explicitly in an @interface or @protocol declaration, or implicitly in an @implementation section. This option always performs its checks as soon as a "@selector(...)" expression is found, while -Wselector only performs its checks in the final stage of compilation. This also enforces the coding style convention that methods and selectors must be declared before being used.


j o a r


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  • Follow-Ups:
    • Re: App hangs when displaying any sheet in 10.5 [SOLVED]
      • From: Graham Cox <email@hidden>
References: 
 >Where to start looking to fix hang? (From: Graham Cox <email@hidden>)
 >Re: Where to start looking to fix hang? (From: j o a r <email@hidden>)
 >App hangs when displaying any sheet in 10.5 [was Re: Where to start looking to fix hang?] (From: Graham Cox <email@hidden>)
 >Re: App hangs when displaying any sheet in 10.5 [was Re: Where to start looking to fix hang?] (From: Graham Cox <email@hidden>)
 >Re: App hangs when displaying any sheet in 10.5 [was Re: Where to start looking to fix hang?] (From: Andy Lee <email@hidden>)
 >Re: App hangs when displaying any sheet in 10.5 [SOLVED] (From: Graham Cox <email@hidden>)
 >Re: App hangs when displaying any sheet in 10.5 [SOLVED] (From: Brian Stern <email@hidden>)
 >Re: App hangs when displaying any sheet in 10.5 [SOLVED] (From: "Hamish Allan" <email@hidden>)
 >Re: App hangs when displaying any sheet in 10.5 [SOLVED] (From: Graham Cox <email@hidden>)

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