Have you heard of mutable keyword?

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Ruth Samuel

  • Aug 30th, 2005
 

The mutable keyword overrides any enclosing const statement. A mutable member of a const object can be modified.  
 
The const keyword can be used to tell the compiler that a certain variable should not be modified once it has been initialized.  
It can also be used to declare functions of a class that do not alter any class data.  
 
nullMutable

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