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istream::gcount

Usage

   #include <iostream.hpp>
   int istream::gcount();

Description

   May be called after any of the unformated input functions (get, getline,
   read) to determine how many characters were transferred. gcount()  should
   be called immediately after the unformatted input function, since
   formatted input functions may use the unformatted functions, and thus
   reset the value.

Example 

   ifstream ifs("things.dat");

   ifs.read(&x, sizeof(Thing));

   if (ifs.gcount() != sizeof(Thing))  // something wrong