NewLC - ETrue Comparison error - Comments

Re: ETrue Comparison error

sameer.chaudhari — Sat, 15 Sep 2007 05:43:38 +0200

Thanks , 4 Ur replay

Mr RenÃ© Brunner
I m agree with U , Opertaor (==)is not defined .

Mr Buttington

" I think the it might be designed deliberatly that it generates a compilation error "

I m also agree with Ur comment ,

Re: ETrue Comparison error

Mr. Buttington F. Phucque Lewis — Fri, 14 Sep 2007 20:38:04 +0200

I think the it might be designed deliberatly that it generates a compilation error

Re: ETrue Comparison error

rbrunner — Fri, 14 Sep 2007 18:21:31 +0200

TBool is defined in E32DEF.H as

typedef int TBool;

but ETrue and EFalse, a bit strangely, in E32STD.H as

enum TFalse {EFalse=FALSE};
enum TTrue {ETrue=TRUE};

Now, if you want to compare with == an int and a value of an enumeration type, a special operator overload must be present. It isn't, that's why your code does not compile.

Re: ETrue Comparison error

sameer.chaudhari — Fri, 14 Sep 2007 17:36:32 +0200

Thnxs 4 ur Immediate reaply eric

But i want to figure out what problem in my code

Sorry ........ I m novice

Re: ETrue Comparison error

eric — Fri, 14 Sep 2007 17:34:14 +0200

You should not test boolean against ETrue or EFalse but use the following:

TBool iFlag = EFalse;
if(iFlag)
{ 
    .... Do something if iFlag is ETrue ...
}

if(!iFlag)
{
     .... Do something if iFlag is EFalse...
}

ETrue Comparison error

sameer.chaudhari — Fri, 14 Sep 2007 17:30:01 +0200

Hi Guyes ,

TBool iFlag = EFalse;
if(iFlag == ETrue)

if i compile the above code i dnt get any error ,
If i Build it then i got this error

Undefined symbol: 'int operator==(int, enum TTrue) (??8@YAHHW4TTrue@@@Z)'

I m currently using Carbide.c++ express edition v1.2.2 Build 5

I Know there is alternate solution available for this code , like ...if(iFlag)