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If you want to guarantee that the object remains the same after calling a member function on it how would you declare the function?
Wiki User
∙ 11y ago
You would place the const keyword before the function body:
class Object
{
public:
Object():m_num(1){}
int GetData() const;
private:
int m_num;
};
int Object::GetData() const {
return(m_num); }
Since GetData() does not alter the instance, it makes sense to declare the function as constant.
Note that class instance data members that are declared mutable can still be altered, regardless of constant functions. The use of constant functions only guarantees the non-mutable members cannot be altered.
Wiki User
∙ 11y ago
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