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c++singletonprivate-constructor

c++ private constructors

If I don't want to allow anyone to create an instance of my class except for my static functions (I think this is called singleton/factory?), is it enough to make the default constructor private, or do I also need to explicitly define and make private a copy constructor and assignment operator?

Solution

  • Yes, I would do all 3 of those manager functions. If not, you do not want to be able to access the copy constructor. For example, this is valid:

    Singleton * s;
Singleton copy( *s );

    So do something like:

    class Singleton
{
private:
  Singleton();
  Singleton(const Singleton &);
  Singleton & operator = (const Singleton &);
};