error when copying blocks into a dynamic_bitset with size() not an integral number of bits_per_block

[Diab Jerius <djerius@…>]

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), an assert() in ~dynamic_bitset() fails and the process is aborted.

For example:

% ./a.out 1
a.out: boost-1.60.0/include/boost/dynamic_bitset/dynamic_bitset.hpp:633: ost::dynamic_bitset<Block, Allocator>::~dynamic_bitset() [with Block = unsigned char; Allocator = std::allocator<unsigned ar>]: 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: ost::dynamic_bitset<Block, Allocator>::~dynamic_bitset() [with Block = unsigned char; Allocator = std::allocator<unsigned ar>]: 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)

Thanks, Diab