Instantiating N submodules (N is a template parameter)

[ecco]

I'll give a brief example of what I intend to to:

 

template <int N>

SC_MODULE(request_scheduler_m) 

{  

   subblock subblock[N];

 

   void proc();

   

   SC_CTOR(request_scheduler_m)     

   {

      unsigned int i;

 

      for (i = 0; i < N; i++)

      {

         round_robin[N]("subblock instance");

      }

(...)

 

Basically, N subblocks must be instantiated inside request_scheduler and N is a template parameter. The compiler is complaining about the code above. Is it possible to do that?

[apfitch]

The compiler is complaining because you can't supply a constructor argument to an element of an array.

 

Either replace your array of subblocks with an array of pointers to sub-blocks, or, even better, use sc_vector (see 1666-2011).

 

kind regards

Alan

[ecco]

Thanks for the answer, using the sc_vector did the trick

 

But how can I use vectors when submodules require extra arguments in the constructor? They tried to cover it in 1666-2011, but they wouldn't be able to write a worst explanation even if they would have put a lot of effort on it. Really tough to understand with incomplete examples.

[apfitch]

I think I can safely say the LRM is not intended to be a tutorial :-)

 

Philipp Hartmann wrote a paper

 

https://complex.offis.de/documents/doc_download/29-scvector-container-and-the-ieee-p1666-2011-systemc-standard

 

and he also wrote the original code.

 

I'm sure Philipp will pop up if you have any further questions,

 

kind regards

Alan

 

P.S. I couldn't get the download link to work - but if you click View, you can then download it from the viewer.

Edited June 21, 2013 by apfitch

[Philipp A Hartmann]

Thanks for letting me know, that the download link is somewhat broken.  I tried to fix it and it seems to be working here now.  The link to the details page is https://complex.offis.de/documents/doc_details/29. In this presentation, several examples for "custom creator functions" are given.  Personally, I prefer the variant of using sc_bind in combination with a local member function:

 

// creator function (member function of surrounding block)
subblock*
request_scheduler_m::create_subblock( const char* nm, size_t idx ) {
  // call constructor with other parameters
  subblock* sub_p = new subblock(nm, param_1, param_2);
  return sub_p;
}

// initialize vector with custom creator
subblock_vec.init( N, sc_bind( &request_scheduler_m::create_subblock, this, sc_unnamed::_1, sc_unnamed::_2 ) );

 

Using this variant of a creator, you can easily "store" and/or prepare the values of the module parameters within member variables of the surrounding module.

 

Greetings from Oldenburg,
  Philipp

Edited June 22, 2013 by Philipp A. Hartmann