Create objects in conditional c++ statements

Question

I am learning c++, and I just got to the object oriented chapter. I have a question about creating objects inside if statements.

The problem I\'m working on says

Answer 1

You can use an rvalue reference to bind in place to either constructed object.

struct Foo
{
  Foo(int bar): bar(bar) {}

  int bar
};

Foo&& f = condition ? Foo(4) : Foo(5);

f.bar = 1000;