Re: '*****' has not been declared

[Marcus Müller]

Hi Nik,

if you use names from a different header file, you'll need to include that header, 
otherwise your compiler can't know what that name means! In this case, you need to include 
the header that defines gr::digital::constellation and gr::digital::constellation_sptr. 
That would be done by

#include <gnuradio/digital/constellation.h>

in your header.

(note: that's a bit of a basic C++ thing, you need to declare the things you use in each 
compilation unit *before* you use them.)

Best regards,
Marcus

PS: kind of surprising to pass in both a shared pointer to a constellation object, and to 
pass-by-value (i.e., make a copy) another constellation object. Hope that makes sense!


On 25.07.22 12:14, Beckmann, Niklas wrote:
> Dear members of the gnuradio mailing list,
>
>
> since 2 days I am trying to fix this error. So maybe one of you guys can help 
> me...
>
> I am grateful for any help.
>
>
> I have the following code, which is the impl.h file of a block from my oot 
> module.
>
>
> #ifndef INCLUDED_FLORIANINETS_BASEBAND_DEROTATION2_IMPL_H
> #define INCLUDED_FLORIANINETS_BASEBAND_DEROTATION2_IMPL_H
>
> #include <gnuradio/FlorianiNets/baseband_derotation2.h>
>
> namespace gr {
> namespace FlorianiNets {
>
> class baseband_derotation2_impl : public baseband_derotation2
> {
> private:
>      float f_mu;
>      float f_error;
>      gr::digital::constellation_sptr;
>      gr::digital::c_constellation;
>      float wrap_phase(float phi);
>
> public:
>      baseband_derotation2_impl(float mu,
>                                gr::digital::constellation_sptr,
>                                gr::digital::constellation);
>      ~baseband_derotation2_impl();
>
>      // Where all the action really happens
>      int work(int noutput_items,
>               gr_vector_const_void_star& input_items,
>               gr_vector_void_star& output_items);
> };
>
> } // namespace FlorianiNets
> } // namespace gr
>
> #endif /* INCLUDED_FLORIANINETS_BASEBAND_DEROTATION2_IMPL_H */
>
> When I run make, I get this error list, and I simply don't know why:
>
> In file included from 
> /home/niklas/gr-FlorianiNets/lib/baseband_derotation2_impl.h:11,
>                   from 
> /home/niklas/gr-FlorianiNets/lib/baseband_derotation2_impl.cc:8:
> /home/niklas/gr-FlorianiNets/lib/../include/gnuradio/FlorianiNets/baseband_derotation2.h:36:24: 
> error: ‘gr::digital’ has not been declared
>     36 |     make(float mu, gr::digital::constellation_sptr, 
> gr::digital::constellation);
>        |                        ^~~~~~~
> /home/niklas/gr-FlorianiNets/lib/../include/gnuradio/FlorianiNets/baseband_derotation2.h:36:57: 
> error: ‘gr::digital’ has not been declared
>     36 |     make(float mu, gr::digital::constellation_sptr, 
> gr::digital::constellation);
>        |                                                         ^~~~~~~
> In file included from 
> /home/niklas/gr-FlorianiNets/lib/baseband_derotation2_impl.cc:8:
> /home/niklas/gr-FlorianiNets/lib/baseband_derotation2_impl.h:21:13: error: ‘digital’ in 
> namespace ‘gr’ does not name a type
>     21 |         gr::digital::constellation_sptr;
>        |             ^~~~~~~
> /home/niklas/gr-FlorianiNets/lib/baseband_derotation2_impl.h:22:13: error: ‘digital’ in 
> namespace ‘gr’ does not name a type
>     22 |         gr::digital::c_constellation;
>        |             ^~~~~~~
> /home/niklas/gr-FlorianiNets/lib/baseband_derotation2_impl.h:27:35: error: ‘gr::digital’ 
> has not been declared
>     27 |                               gr::digital::constellation_sptr,
>        |                                   ^~~~~~~
> /home/niklas/gr-FlorianiNets/lib/baseband_derotation2_impl.h:28:35: error: ‘gr::digital’ 
> has not been declared
>     28 |                               gr::digital::constellation);
>        |                                   ^~~~~~~
>
>
>
> I tried everything, what I know to fix this, but I did not manage to do so.
> Maybe someone else has a good advice.
>
> Thank you very much,
> Nik

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