Disabling possibility of instantiation of base struct-CodePudding

I have a usecase for two different structs (just storage of data) which share some common members, e.g.

struct Foo {
  int i;
  int j;
};

struct Bar {
  int i;
  float f;
};

The common data could be represented in a base struct but I'd like to disable the possibility of creating an object of the base struct.

CodePudding user response：

If you make the constructor protected, then only derived classes can access it:

struct Base {
  int i;
 protected:
  Base() = default;
};

CodePudding user response：

One can artificially introduce an abstract method in the base class, e.g.

struct Base {
  int i;
 protected:
  virtual void blockMe() const = 0;
};

struct Foo : public Base {
  int j;
 private:
  void blockMe() const final {}
};

struct Bar : public Base {
  float f;
 private:
  void blockMe() const final {}
};