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ios::operator void*

Usage

   #include <iostream.hpp>
   int ios::operator void*() const;

Description

   Equivalent to (rdstate()? 0: this). Used for state testing as per the
   example below.

Example 

   double d;

   while (cin >> d) {
       cout << "All is well\n";
       ...;
   }

Return Value

   Returns a null (zero) pointer if any error flag is set, some other
   pointer value otherwise.