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List:       kde-devel
Subject:    Re: error: forward declaration of
From:       Michael Howell <mhowell123 () gmail ! com>
Date:       2009-03-16 0:05:34
Message-ID: 200903151705.39580.mhowell123 () gmail ! com
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On Sunday 15 March 2009 16:56:15 kaushik saurabh wrote:
> invalid use of incomplete type
The example is wrong. Or, more specifically, the example is not #include'ing a 
header that is needed.

= Stop here if you don't want the technical description =
If you want to use anything, you must declare it. This is in the header files 
or in your actual code.
Headers are basically canned declarations. For example, a header might declare 
something like this.
[code]
class SomeNeededClass; // SomeNeededClass is an incomplete type.
class SomeNeedingClass { // SomeNeedingClass is a complete type.
    SomeNeedingClass(const SomeNeededClass& needed);
    doSomething();
};
[/code]
Though SomeNeedingClass can declare that it uses SomeNeededClass, it cannot 
actually use it, since no information on how it can be used is declared.

-- 
Michael Howellmhowell123@gmail.com

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