Please explain a gcc weirdness

[Thiago Macieira]

Em Quarta-feira 23. Junho 2010, às 21.28.09, Sebastian Trüg escreveu:
> Why does the following code fail with gcc 4.3.4:
> 
> QString uri...;
> Nepomuk::Resource res( KUrl( uri ) );
> 
> while this works:
> 
> KUrl resourceUri( uri );
> Nepomuk::Resource res( resourceUri );
> 
> And by "fail" I mean that gcc does not recognize res as being of type
> Nepomuk::Resource.

Because it's not of that type.

> I would simply like to understand this.

Despite what you might think, when you wrote:

	Nepomuk::Resource res( KUrl( uri ) );

you didn't declare an object of type Nepomuk::Resource called "res" and call 
its constructor with a KUrl parameter.

You declared an external function (the "extern" keyword is optional) called 
res that returns Nepmuk::Resource.

This is correct behaviour.

It's just one of those things that bite you once, then you remember forever.

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Senior Product Manager - Nokia, Qt Development Frameworks
      PGP/GPG: 0x6EF45358; fingerprint:
      E067 918B B660 DBD1 105C  966C 33F5 F005 6EF4 5358
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