[Qt-interest] Splitting library?

[Anatoly Burakov]

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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