classes and templates correct order.

[Roberto Diaz <rdiazmartin at vivaldi dot dhis dot org>]

I will explain better: It seems it is not important the order of
declaratinon in the header file for classes so I can have:

class A {
 B c;
.... etc...
 };

class B {
 ...etc..
};

and it works.. but it is not the same for templates:

This does not work.. 

class A {
 B<int> a;
 ... etc ..
};

template <class T > B {
...etc..
};

It seems the header file must to declare templates firsly to use
them.. but it is not the case for classes..

I also would like to know how could I put my template's functions in
another file but the header (in order to make a library) without recieving
compalinings about unresolved symbols) (some trick to get storage for
templates?)

Thank you!

> Hi!
> 
> I have been searching the lists available at gcc.gnu.org I wonder if this
> one is the correct one to send doubts about g++.
> 
> I have this problem:
> 
> this compile without problems:
> 
> template< class T > 
> class threadData {
> public:
>   threadData ();
>   ~threadData ();
>   T* operator->();
>   T &getObject () {return object;}
>   pthread_mutex_t getMutex () {return localMutex;}
>  private:
>   pthread_mutex_t localMutex; // mutex to protect this object
>   pthread_cond_t localCond; // local conditional variable
>   T object; // our real object 
> };
> 
> // see function definitions below.
> 
> // our exception (thread::run() thread::threaded() ) ----->
> template < class T >
> class runError {
>   friend class thread;
>   friend class threadData < T >;
>  public:
>  ..... etc ....
> 
> So I have two friends declared.. the class thread is defined later in the
> header file *after* runError.. this is not causing me troubles.. the
> problem is that if I try to define the template threadData *after*
> runError then g++ complaints and says something like "threadData not a
> template"..
> 
> sorry if this is not the correct list to ask this questions.. I was
> looking for g++-help without success..
> 
> Thank you! 
> 
> Regards
> 
> Roberto
> 
> ------------------------------------------------------------------------
> Roberto Diaz <rdiazmartin@vivaldi.dhis.org>
> http://vivaldi.dhis.org
> Powered by GNU running on a Linux kernel.
> Powered by Debian (The real wonder)
> 
> Concerto Grosso Op. 3/8 A minor
> Antonio Vivaldi (so... do you need beautiful words?)
> ------------------------------------------------------------------------
> 
> 

Regards

Roberto

------------------------------------------------------------------------
Roberto Diaz <rdiazmartin@vivaldi.dhis.org>
http://vivaldi.dhis.org
Powered by GNU running on a Linux kernel.
Powered by Debian (The real wonder)

Concerto Grosso Op. 3/8 A minor
Antonio Vivaldi (so... do you need beautiful words?)
------------------------------------------------------------------------