Question

Is there any way to know if an object is a const object or regular object, for instance consider the following class

class String
{
   String(const char* str);
};

if user create a const object from String then there is no reason to copy the passed native string and that because he will not make any manipulation on it, the only thing he will do is get string size, string search and other functions that will not change the string.

Answer 1

There is a very good reason for copying – you can’t know that the lifetime of the const char * is the same as that of the String object. And no, there is no way of knowing that you are constructing a const object.