[Boost-users] error when copying blocks into a dynamic_bitset

Subject: [Boost-users] error when copying blocks into a dynamic_bitset
From: Diab Jerius (djerius_at_[hidden])
Date: 2016-04-26 12:38:50

Hi,

I'm trying to initialize a dynamic_bitset<unsigned char> from a vector
of blocks. Here's the code:

  #include <cstdlib>
  #include <vector>
  #include <boost/dynamic_bitset.hpp>

  typedef boost::dynamic_bitset<unsigned char> BitSet;
  typedef std::vector<BitSet::block_type> Block;

  int main(int argc, char* argv[]) {

      int nbits = atoi( argv[1] );

      BitSet bits( nbits );
      Block buffer;
      buffer.resize( bits.num_blocks(), 0xff );

      boost::from_block_range(buffer.begin(),buffer.end(), bits );

      return 0;
  }

If the bitset size isn't a multiple of sizeof(unsigned char) (here 8)
, ~dynamic_bitset() throws an exception.

For example:

  % ./a.out 1
  a.out: boost-1.60.0/include/boost/dynamic_bitset/dynamic_bitset.hpp:633:
boost::dynamic_bitset<Block, Allocator>::~dynamic_bitset()
   [with Block = unsigned char; Allocator = std::allocator<unsigned
char>]: Assertion `m_check_invariants()' failed.
  Aborted

  % ./a.out 8

  % ./a.out 15
  a.out: boost-1.60.0/boost/dynamic_bitset/dynamic_bitset.hpp:633:
boost::dynamic_bitset<Block, Allocator>::~dynamic_bitset()
  [with Block = unsigned char; Allocator = std::allocator<unsigned
char>]: Assertion `m_check_invariants()' failed.
  Aborted
  % ./a.out 16

  %

I see this with 1.59 & 1.60 using either g++ 4.7.2 or Apple LLVM
version 6.0 (clang-600.0.57) (based on LLVM 3.5svn)

I believe that I'm following the rules for the buffer type and size.
Is there something I'm missing?

Thanks!

Diab