The Microsoft Input/Output Stream Classes (iostream.hlp) (Table of Contents; Topic list)
streambuf::in_avail
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──The Microsoft iostream Classes────────────────────────────────────────────
 
  int in_avail() const;
 
  Remarks
 
  Returns the number of characters in the get area that are available for
  fetching. These characters are between the gptr and egptr pointers and
  may be fetched with a guarantee of no errors.
 
 
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