CircularBuffer class
          #include <eckit/io/CircularBuffer.h>
        
        
Base classes
- class NonCopyable
- Inherit from this class to make a NonCopyable class.
Constructors, destructors, conversion operators
- 
              CircularBuffer(size_t size = 64*1024,
              size_t capactity = std::numeric_limits<size_t>::max()) 
- ~CircularBuffer()