[Qt-interest] Splitting library?

[Anatoly Burakov]

Hong Jiang wrote:
> Are you sure it is a compiler error? Or is it a linker error?
>
> --Hong
>
> On Wed, Feb 10, 2010 at 10:34 AM, Anatoly Burakov 
> <burakov.anatoly at googlemail.com 
> <mailto:burakov.anatoly at googlemail.com>> wrote:
>
>     Hi all
>
>     This question is not exactly related to QT, more of a general C++
>     question. Sorry for maybe a n00b-type problem but everyone has to
>     start somewhere :-)
>
>     I have made a small class library for use within a family of
>     applications. I have separated it into several header/source files
>     one per class, and one "root" header file which includes all these
>     "child" header files. This whole library uses a separate
>     namespace. On its own the library compiles OK, but whenever i try
>     to include the "root" library header into the other project and
>     try to use classes from the library - compiler can't find them
>     (although IDE itself can - it lists all member functions when
>     autocompleting code etc.) and gives an error of "undefined
>     reference to Namespace::ClassName()::ClassName()". Am i missing
>     something? By the way, the library worked fine when it was not
>     separated into several files, so there must be something i don't
>     understand about how headers work...
>
>     The structure of the root header file is following:
>     -------------------------
>
>     #include <math.h>
>
>     namespace Namespace {
>       // classes pre-declarations follow here e.g.
>       class childOne;
>       class childTwo;
>
>       // helper function header used throughout the class library e.g.
>       double hlpFunc(const double &value);
>
>       // helper enum used throughout the class library e.g.
>       enum hlpEnum {
>          varA = 0, varB = 5, varC = 10
>          };
>     }
>
>     // includes for child classes' headers e.g.
>     #include "childone.h"
>     #include "childtwo.h"
>
>     -------------------------
>
>     Best regards,
>     Anatoly
>
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>
>
Well, yes, it is a linking error - but still it is an error, and i would 
like to know how to fix it.

Anatoly
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