Creating object with constant parameters from stream

Question

let us assume I have a class with

#include 
using namespace std;

class Test{
    public:
        friend istream& operator >> (istr         


        

Answer 1

You can't. Streams are something you read from, they are not factories or something like that.

You have several choices, though:

• Read from the stream to a non-const, and then use that to initialize your const object

• You can make dummy non-const, initialize your object as unread, and then read into dummy; then you can pass outside only const& to dummy