How do I declare an array of objects whose class has no default constructor?

Question

If a class has only one constructor with one parameter, how to declare an array? I know that vector is recommended in this case. For example, if I have a class

Answer 1

If it makes sense for your class, you could provide a default value for your constructor parameter:

class Foo
{ 
public: 
  explicit Foo(int i = 0); 
}

Now you have a default constructor. (A "default constructor" is a constructor that can be called with no arguments: FAQ)

I'd also recommend making your constructor explicit, as I did above. It will prevent you from getting Foos from ints when you don't want request them.