Casting an input value using block() function

GNU Radio
1

Hi,

My question is related to the work function using block() as provided in
GRExtras. I have a block that input a gr_complex value and output a
gr_complex value. I’m trying to cast the input and output, in order to
use
them in my work function, what I have is:

int work(
const InputItems &input_items,
const OutputItems &output_items
){

  std::complex<float> * in = input_items[0].cast<std::complex<float>

*>();
std::complex * out =
output_items[0].cast<std::complex
*>();

 //Processing here

} //End of work function

I can cast the output without problem, but I cannot do it for the input.
I
got the following error:

/home/project/grextras/include/gnuradio/block.h: In member function T
gnuradio::Buffer::cast() const [with T = std::complex,
PtrType = const void]:
/home/project/grextras/lib/s_asrp_st2up_insertcp.cc:76:77:
instantiated
from here
/home/project/grextras/include/gnuradio/block.h:43:47: error:
reinterpret_cast from type const void* to type std::complex*
casts away qualifiers

So, I checked into the block.h I have the following:

typedef std::vector<Buffer<const void *> > InputItems;
typedef std::vector<Buffer<void *> > OutputItems;

Does it mean that I cannot cast my input_items in my work function?
If the answer is no, how can I use the input_items in my work function?,
because I have to receive a stream of values.

Thanks for your comments,

Regards,

Jose

2

Hi,

In order to add more information, I found some information here:
http://publib.boulder.ibm.com/infocenter/lnxpcomp/v8v101/index.jsp?topic=%2Fcom.ibm.xlcpp8l.doc%2Flanguage%2Fref%2Fkeyword_const_cast.htm

As I understand, the issue is with this line in block. h

typedef std::vector<Buffer<const void *> > InputItems;

Because it is casting using const, rather than:

typedef std::vector<Buffer<void *> > OutputItems;

I’m stuck in this point, because I’m not sure how to use the input_items
in
my work function, if I’m not able to cast it.

Regards,

Jose

On Mon, Nov 5, 2012 at 10:42 AM, Jose T. Diaz
<[email protected]

3

Thanks Bastian,

This fix the issue,

Regards,

Jose