c++ nonconst-const-overloaded method choosing -

i have const-overloaded methods in class:

class a{   public:      typedef int data[10];             data& operator[](int index);      const data& operator[](int index) const; } 

this class implementing copy-on-write internal data. figured since allowing access data directly, must create copy of shared data (if shared obviously) on every use of operator[], not operator[] const. however, if code using operator[] reading data, object not declared const, still cause creating copy, operator[] used. there syntax let me allow choose of operators calling?

yes: const_cast<a const&>(anaobj)[5].