Getting error: prototype for does not match any in class

Hello,

I am writing my own signal processing block to calculate |x1|^2+|x2|^2
where x1 and x2 are complex. But I am getting below error

[ 5%] Building CXX object
lib/CMakeFiles/gnuradio-testmodule.dir/power2_cf_impl.cc.o
/home/cogwsn/GRProject/gr-testmodule/lib/power2_cf_impl.cc:32:5:* error:
prototype for* ‘gr::testmodule::power2_cf::sptr
gr::testmodule::power2_cf::make(size_t)’ does not match any in class
‘gr::testmodule::power2_cf’
/home/cogwsn/GRProject/gr-testmodule/include/testmodule/power2_cf.h:49:19:
error: candidate is: static gr::testmodule::power2_cf::sptr
gr::testmodule::power2_cf::make()
/home/cogwsn/GRProject/gr-testmodule/lib/power2_cf_impl.cc:41:5: error:
prototype for ‘gr::testmodule::power2_cf_impl::power2_cf_impl(size_t)’
does
not match any in class ‘gr::testmodule::power2_cf_impl’
/home/cogwsn/GRProject/gr-testmodule/lib/power2_cf_impl.h:29:11: error:
candidates are: gr::testmodule::power2_cf_impl::power2_cf_impl(const
gr::testmodule::power2_cf_impl&)
/home/cogwsn/GRProject/gr-testmodule/lib/power2_cf_impl.h:35:7:
error: gr::testmodule::power2_cf_impl::power2_cf_impl()
/home/cogwsn/GRProject/gr-testmodule/lib/power2_cf_impl.cc: In member
function ‘virtual int gr::testmodule::power2_cf_impl::work(int,
gr_vector_const_void_star&, gr_vector_void_star&)’:
/home/cogwsn/GRProject/gr-testmodule/lib/power2_cf_impl.cc:67:34: error:
‘d_vlen’ was not declared in this scope
/home/cogwsn/GRProject/gr-testmodule/lib/power2_cf_impl.cc:74:46: error:
cannot convert ‘float’ to ‘float*’ in argument passing
/home/cogwsn/GRProject/gr-testmodule/lib/power2_cf_impl.cc:75:46: error:
cannot convert ‘float’ to ‘float*’ in argument passing
/home/cogwsn/GRProject/gr-testmodule/lib/power2_cf_impl.cc:76:44: error:
‘volk_32fc_x2_multiply_32fc’ was not declared in this scope
/home/cogwsn/GRProject/gr-testmodule/lib/power2_cf_impl.cc:78:39: error:
‘volk_32f_x2_add_32f’ was not declared in this scope
make[2]: ***
[lib/CMakeFiles/gnuradio-testmodule.dir/power2_cf_impl.cc.o]
Error 1
make[1]: *** [lib/CMakeFiles/gnuradio-testmodule.dir/all] Error 2

Please let me where I am doing mistakes. Below is the code.

#ifdef HAVE_CONFIG_H
#include “config.h”
#endif

#include <gr_io_signature.h>
#include “power2_cf_impl.h”
#include <volk/volk.h>
namespace gr {
namespace testmodule {

power2_cf::sptr power2_cf::make(size_t vlen)
{
  return gnuradio::get_initial_sptr(new power2_cf_impl(size_t 

vlen));
}

/*
 * The private constructor
 */
power2_cf_impl::power2_cf_impl(size_t vlen)
  : gr_sync_block("power2_cf",
          gr_make_io_signature(1, 2, sizeof(gr_complex)*vlen),
          gr_make_io_signature(1, 1, sizeof(float)*vlen)),

d_vlen(vlen)
{
const int alignment_multiple =
volk_get_alignment() / sizeof(float);
set_alignment(std::max(1,alignment_multiple));
}

/*
 * Our virtual destructor.
 */
power2_cf_impl::~power2_cf_impl()
{
}

int
power2_cf_impl::work(int noutput_items,
          gr_vector_const_void_star &input_items,
          gr_vector_void_star &output_items)
{
   const gr_complex *in1 = (const gr_complex *) input_items[0];
   const gr_complex *in2 = (const gr_complex *) input_items[1];
   float *out = (float *) output_items[0];
   int noi = noutput_items * d_vlen;
    // Do <+signal processing+>

float x1=0;
float x2=0;
float x3=0;
float x4=0;
   volk_32fc_magnitude_32f_u(x1, in1, noi);
   volk_32fc_magnitude_32f_u(x2, in2, noi);
volk_32fc_x2_multiply_32fc(x3, x1, x1, noi);
volk_32fc_x2_multiply_32fc(x4, x2, x2, noi);
 volk_32f_x2_add_32f(out, x3, x4, noi);
    // Tell runtime system how many output items we produced.
    return noutput_items;
}

} /* namespace testmodule /
} /
namespace gr */

Regards,
Kunal

On 06/06/2014 06:00 PM, kunal sankhe wrote:

gr::testmodule::power2_cf
/home/cogwsn/GRProject/gr-testmodule/include/testmodule/power2_cf.h:49:19:
error: candidate is: static gr::testmodule::power2_cf::sptr
gr::testmodule::power2_cf::make()

Kunal,

This error message is telling you all you need to know: Compare the
definition and declaration of the make() function, and you’ll see
they’re different.

gr_vector_const_void_star&, gr_vector_void_star&):
/home/cogwsn/GRProject/gr-testmodule/lib/power2_cf_impl.cc:67:34: error:
d_vlen was not declared in this scope
/home/cogwsn/GRProject/gr-testmodule/lib/power2_cf_impl.cc:74:46: error:
cannot convert float to float* in argument passing

Likewise, this error message is very explicit. The function takes
float*, and you pass float. Check the function signature.

A word of caution: If you’re writing C++ blocks with VOLK accelerators,
you should be very fluent in C++ (pointers, too) and familiar with your
compiler of choice.

If you are still learning, that’s fine, of course! But maybe you should
start with something a bit simpler.

Cheers,
M

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