Fluent interfaces and inheritance in C++ -

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I want to create a base (abstract) (let's call it type :: base ) With the usual FonseyaNanti and a fluent interface, the problem I am facing is the return type of all the methods 

  class base {public: base (); Virtual ~ (base); In the base & amp; With_foo (); In the base & amp; With_bar (); Protected: // whatever ...};

I can now subtype, e.g.:

pre- class my_type: public base {public: myType (); // more methods ...};

The problem is that while using these subtypes: 

  my_type build_my_type () {my_type (). Return_foo (). With_bar (); }

This will not compile because we are returning the base instead of my_type.

I know that I only: 

  my_type build_my_type () {my_type ret; . Ret.with_foo () with_bar (); Return writ; }

But I was wondering how can I apply it, and I have not got any reasonable ideas, some suggestions?

This type of "losing type" problem can be resolved with templates - but it is more complex .

Example. 

  class pizza {string topping; Public: Virtual double price () const; }; Template & lt; Square t, class base & gt; Class Fluent Pieza: {... some implementation with public base {T * anchovies (...);}; }; Class Recta Pizza: Public Fluent PGA & Lt; Recta pizzas, pizzas & gt; {Double price () const {return length * width; :)}}; Class Square Pizza: Public Fluent Pizza & Lt; Square Pizza, Rect Pizzes & gt; {    ... anything else ... };

You can then 

  squarepage * p = (new squarepage) - & gt; Can write with anchovies ();             Class T: Public Fluent & lt; T, B & gt;

A perspective interface can not be used on another perspective object, but instead at pointers: 

  class pizza {...}; Square RectPizza {...}; Class Square pizza ... ... you can imagine ...}; Template & lt; Class T & gt; Class Fluent Pejopet {T * Pizza; Public: FluentPizzaPtr withAnchovies () {Pizza-> Adivatives (); // A seamless withdrawal method; }};

Use this way: 

  FlintPagepet & lt; Squarepage & gt; SquarePizzaFactory () {...} FluentPassipster & lt; Square Pizzia & gt; MyPizza = squarePizzaFactory () withAnchovies () .;

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