Is this usage of definition correct?

[fl]

Hi,

I read the below code snippet on-line:






''''''''''''''''''''
#include <gr_sync_block.h>
class my_block_cc;
typedef boost::shared_ptr<6829_my_block_cc> 6829_my_block_cc_sptr;
6829_my_block_cc_sptr 6829_make_my_block_cc();
class my_block_cc : public gr_sync_block
{
private:
unsigned int d_count;
friend 6829_my_block_cc_sptr 6829_make_my_block_cc();
6829_my_block_cc();
public:
int work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items);
////////////////

It is found line 3 has below in the container(Is this correctly called?):
"6829_my_block_cc"

But I see this private function is declared in the last line of the private
section. This puzzles me a lot, as I think it should like the second line
to declare "my_block_cc" first, then it is defined.

Could you help me on it?


Regards,

[Kalle Olavi Niemitalo]

fl <rxj...@gmail.com> writes:

> I read the below code snippet on-line:
>
> ''''''''''''''''''''
> #include <gr_sync_block.h>
> class my_block_cc;
> typedef boost::shared_ptr<6829_my_block_cc> 6829_my_block_cc_sptr;
> 6829_my_block_cc_sptr 6829_make_my_block_cc();

That seems corrupt; C++ does not support identifiers that start
with digits, like 6829_my_block_cc.
If you remove each "6829_", then it looks more sensible,
and the function you asked about becomes a constructor.

http://zoo.cs.yale.edu/classes/cs434/cs434-2012-fall/lectures/backup/6-gnuradio-jh.ppt
page 25 contains similar code, except it uses "cs434_" instead of "6829_".
That code doesn't work either.