Use const_cast on a const reference.

   
#include <iostream>
using namespace std;
   
void sqrval(const int &val)
{
  // cast away const on val
  const_cast<int &> (val) = val * val;
}
   
int main()
{
  int x = 10;
   
  cout << "x before call: " << x << endl;
  sqrval(x);
  cout << "x after call: " << x << endl;
   
  return 0;
}

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3.	The const_cast operator is used to explicitly override const and/or volatile in a cast.
4.	The static_cast operator performs a nonpolymorphic cast.
5.	The reinterpret_cast operator converts one type into a fundamentally different type.
6.	The dynamic_cast performs a run-time cast that verifies the validity of a cast.
7.	Replacing typeid with dynamic_cast

Use const_cast on a const reference. : cast « Class « C++

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