Constant Member Functions

• Keyword const may be applied to member functions (or member operators)
• Meaning: the object will not be changed when that method is invoked
• Enforced by the compiler

class IntArray
{
public:
  size_t Size() const;
private:
  size_t size_;
} ;

size_t IntArray::Size() const
{
  return size_;
}

• Const methods are distinct from non-const methods by the same name