Create a new non-modifiable buffer that represents the given POD vector.
template< typename PodType, typename Allocator> const_buffers_1 buffer( const std::vector< PodType, Allocator > & data);
value equivalent to:
const_buffers_1( data.size() ? &data : 0, data.size() * sizeof(PodType));
The buffer is invalidated by any vector operation that would also invalidate iterators.