From: bop@gmb.dk   
      
   Chris Vine skrev 2012-12-26 14:38:   
   >   
   > g++ accepts this, but clang++ does not:   
   >   
   >     template    
   >     struct Test {   
   >       mutable T t;   
   >       Test(): t(T()) {}   
   >     };   
   >   
   >     int main() {   
   >       Test t;   
   >     }   
   >   
   > clang++-3.2 fails with the message "error: 'mutable' and 'const'   
   > cannot be mixed".   
   >   
   > Is clang++ correct in failing to accept this?   
   >   
      
   Probably.   
      
   The C++11 standard says (7.1.1 Storage class specifiers, §10):   
      
   "The mutable specifier can be applied only to names of class data   
   members (9.2) and cannot be applied to names declared const or static,   
   and cannot be applied to reference members."   
      
   It doesn't mention templates, but likely applies there too.   
      
      
   Bo Persson   
      
      
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