Friend function is unable to construct a unique pointer of the class

Question

I have a certain design strategy where the constructor of my class is private and can only be constructed by friends of the class. Inside the friend function, I am trying to cre

Answer 1

In your example, Foo() is a friend, but it isn't the function that's creating the Spam - make_unique is internally calling new Spam itself. The simple fix is to just have Foo() actually construct the Spam directly:

void Foo() {
    std::unique_ptr spam(new Spam(10));
}