[Qt-interest] Splitting library?

[Hong Jiang]

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> 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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