[SOLVED] Why QString no need to include?

[Arendell]

I can use it without include header file.
Why I can't use main header instead sub header file? Ex. B inherited from A Why I can't just include A?
Just curius, hope this not wrong place to ask again lol.

Thanks.

[SGaist]

Hi,

Your question isn't really clear. But if I understood it correctly: when creating a class B from A and you want to use it somewhere else you must include B's header because A's header will not provide anything for B.

As for QString, it's a class that's used throughout all of Qt so its header is included frequently in other Qt classes headers.

[Arendell]

Oh! I see now and I feel like I'm a stupid. lol
It's just a basic logic.

Thanks.
[quote author="SGaist" date="1377802706"]Hi,

Your question isn't really clear. But if I understood it correctly: when creating a class B from A and you want to use it somewhere else you must include B's header because A's header will not provide anything for B.

As for QString, it's a class that's used throughout all of Qt so its header is included frequently in other Qt classes headers.
[/quote]

[SGaist]

You're welcome !

If this answers your question, please update the thread title to solved so other forum users may know :)