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A streambuf Specialized for In Memory Operations

   The strstreambuf class is a derivation of streambuf that uses an area of
   memory, either user nominated or dynamically allocated.

   The extra public interface is as follows:

   const int default_allocation = 32;

   class strstreambuf : public streambuf {
   public:
       strstreambuf(int = default_allocation);
       strstreambuf(char *memory, int length, char *put_area);
       strstreambuf(void *(*allocator)(size_t), void
   (*deallocator)(void *), int = default_allocation);

       void freeze(int n = 1);
       char *str();
       streambuf *setbuf(char *memory, int length);
   };

   The following functions require the inclusion of file sstream.hpp.