/// The MutableBufferSequence used to represent the writable bytes.
using mutable_buffers_type = __implementation_defined__;
#else
using const_buffers_type = detail::buffers_pair<false>;
/// The MutableBufferSequence used to represent the writable bytes.
using mutable_buffers_type = __implementation_defined__;
#else
using const_buffers_type = detail::buffers_pair<false>;