NFD » ndn-cxx

OBufferStream::buf() unconditionally calls flush() before returning the buffer. However, some operations such as boost::iostreams::copy() will close both source and sink after they're done. Therefore, calling buf() after copying into a OBufferStream (a common case) will result in flushing a closed stream/device, which is illegal. If ndn-cxx is built in debug mode, an assertion failure like the following is triggered.

/usr/include/boost/iostreams/detail/optional.hpp:55: T& boost::iostreams::detail::optional<T>::operator*() [with T = boost::iostreams::detail::concept_adapter<ndn::detail::BufferAppendDevice>]: Assertion `initialized_' failed.