Question

I get the following error at this line:

const short pcmSample = *reinterpret_cast<const short*>(*(buffer->index));

buffer is an object of class accumlator.

Here I am trying to convert a byte array into shorts. The code throws this runtime error and terminates.

class accumlator : public boost::circular_buffer<char>
{
  public:
    boost::circular_buffer<char>::iterator index;
};

i have initialized the iterator to point to begin of buffer

and index is a iterator to circular buffer.

boost::cb_details::iterator::reference
boost::cb_details::iterator::operator*() const [with
Buff = boost::circular_buffer, Traits =
boost::cb_details::nonconst_traits >,
boost::cb_details::iterator::reference = char&]:
Assertion `m_it != 0′ failed.

i have even tracked this to the file boost/circular_buffer/detail.hpp

the assert condition checks – if iterator is pointing to end.
if it is pointing to end then it throws the assert.

Thanks in advance.

Answer 1

It seems you didn’t assign index to a value. The operator* is doing a runtime check to make sure it’s pointing to valid (non-0) value.