#ifndef Sample_h#define Sample_h#pragma interface#include <stream.h>ostream& operator<< (ostream&, const class sample&);  class sample                // sortofa big sndblock, containing a word{  friend class speechstream;public:  sample()                       { buf_=0; }  ~sample()                      { delete [] buf_; }  long len() const               { return length_; }  int rate() const               { return rate_; }  int bits() const               { return bits_; }  short operator[] (int k) const { return buf_[k]; }    void write_au  (ostream&) const;  void write_wav (ostream&) const;private:  short* buf_;  int rate_,bits_;  long length_;};class sample_format{public:  enum format_t { au, wav };  friend ostream& operator<< (ostream& o, sample_format::format_t f)     { format_ = f;  return o; }  format_t format() const { return format_; }  static format_t format_;};#endif