[Issue 319] New: local variable can hide member variable

[Bruno Medeiros]

Chris Nicholson-Sauls wrote:
> d-bugmail at puremagic.com wrote:
>> http://d.puremagic.com/issues/show_bug.cgi?id=319
>>
>>            Summary: local variable can hide member variable
>>            Product: D
>>            Version: 0.165
>>           Platform: PC
>>         OS/Version: Linux
>>             Status: NEW
>>           Severity: normal
>>           Priority: P2
>>          Component: DMD
>>         AssignedTo: bugzilla at digitalmars.com
>>         ReportedBy: benoit at tionex.de
>>
>>
>> class C{
>>     int mVal;
>>     public this(){
>>         int mVal = 2;
>>     }
>>     public void func(){
>>         int mVal = 2;
>>     }
>> }
>>
>> This compiles. But I think using a local variable, hiding a member 
>> variable
>> should be illegal.
>>
> 
> I'm sorry but.... why?  One can easily disambiguate using the already 
> provided 'this' referance, and there can be perfectly valid reasons to 
> allow this (such as settors and obvious-use constructor parameters).
> 
> # class C {
> #   int x ;
> #
> #   public void func () {
> #     int x ;
> #
> #     x = 2;      // modify local variable
> #     this.x = 2; // modify member variable
> #   }
> # }
> 
> A warning: maybe.  An error: for the love of D, no!
> 
> -- Chris Nicholson-Sauls

I often end up using stuff like that in constructors:

   class C {
     int x ;

     public this (int x) {
       this.x = x;
     }
   }

-- 
Bruno Medeiros - MSc in CS/E student
http://www.prowiki.org/wiki4d/wiki.cgi?BrunoMedeiros#D