c++ - Converting a stream to bool doesn't work on another compiler -

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Why does this work but fails with it? It also works on GCC: 

  bool b = std :: cin;    
 
 
 You should add the language standard and the compiler that you compile.  
 By C ++11,  std :: basic_ios  had  operator zero * , because instead of  explicit operator in C + 11 Boole is   
 The second one is obvious, which means that an underlying conversion like your example can not use it.  
  
  operator zero * () const {return this  
 
 
  
 -> (unsuccessful)? 0: const_cast & lt; Basic_ios * & gt; (this); }   
 The bug has been resolved from 2014-09-24, so the next release should be corrected.

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