RE: Re[2]: [Dev-C++] templates and inheritance

> -----Original Message-----
> From: dev...@li...=20
> [mailto:dev...@li...] On Behalf Of Astar
> Sent: Tuesday, April 29, 2003 11:56 PM
> To: Dev-Cpp mail list
> Subject: Re[2]: [Dev-C++] templates and inheritance
>=20
> :)))) very interesting... of course i have main-function (my project
> consist of ~40-45 files and i thought that writing about my
> main-function (and other parts of project) is unnecessary)
>=20
> i find problem (it isn't absence of main-function :)).
>=20
> I have problem with writing implementation of methods
> (constructor/destructor too) in two files. I mean, if i write it only
> in .h file:
>         template <class T, int o>
>         class CConteiner{
>             CConteiner(){....}
>             ~CConteiner(){....};
>         };
>=20
> it's OK!(compiling and linking) ....... but if i write implementation
> of constructor/destructor in .cpp file i have link error. I write:
>=20
>         template <class T, int o>
>         CConteiner<T, optimum>::CConteiner(){
>         .......
>         }
>=20
>         template <class T, int o>
>         CConteiner<T, optimum>::~CConteiner(){
>         .......
>         }
>=20
> what's wrong with my code???
> or may be i must write body of methods in declaration?
>=20
>=20
> PS. sorry for my english :)


The definitions of template functions and classes must be provided at =
every
file you use them. If you wish to place the definition of the template =
in
one implementation file, you have to use the keyword export. Example:


export template<class T>
class whatever
{
 // ...
};



However its implementation is very tough, and not many compilers support =
the
keyword "export".




Ioannis Vranos
=20
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