After further investigation, it turns out there exists a minor modification that can be performed to the next() function, which makes the code work properly on clang++ versions above 7.0.0, but makes it stop working for all other clang++ versions. Have a look at the following code, taken from my previous solution. template <int N> … Read more
make_unique perfect forwards the arguments you pass to it; in your example you’re passing an lvalue (x) to the function, so it’ll deduce the argument type as int&. Your friend function declaration needs to be friend std::unique_ptr<A> std::make_unique<A>(T&); Similarly, if you were to move(x) within CreateA, the friend declaration would need to be friend std::unique_ptr<A> … Read more
Section 11.5 “The C++ Programming Language” by Bjarne Stroustrup states that ordinary member functions get 3 things: access to internals of class are in the scope of the class must be invoked on an instance friends get only 1. static functions get 1 and 2.
If you define your operator overloaded function as member function, then the compiler translates expressions like s1 + s2 into s1.operator+(s2). That means, the operator overloaded member function gets invoked on the first operand. That is how member functions work! But what if the first operand is not a class? There’s a major problem if … Read more