Quiz: Operators and Templates

5 questionsNo time limitPass: 60%+10 XP on first pass

Make your classes work with +, ==, << and more, use friend functions correctly, and write generic code once with function and class templates.

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Question 1
Why is operator<< usually a non-member (often friend) function?
It's fasterIts left operand is the output stream, not your classMembers can't return referencesIt must be static
Question 2
Which operator can NOT be overloaded in C++?
==::[]

Question 3

What does this print?

#include <iostream>
using namespace std;
template <typename T>
T twice(T x) { return x + x; }
int main() {
    cout << twice(21) << " " << twice(1.5);
    return 0;
}

2121 342 342 1.51.5Error

Question 4
Is friendship inherited by derived classes?
Yes, alwaysNoOnly for public inheritanceOnly for templates
Question 5
What is vector<int> an example of?
A function templateA class template instantiated with intAn abstract classA macro