Translate C++ to D

[doob]

Luca Lupo wrote:
> Thanks to everybody for the help, I have converted the other files .h to D I post it now, somebody can said me if it's well?
> 
> Thanks
> 
> //Observer.h
> 
> #include<string>
> using namespace std;
> 
> class Subject;
> 
> class Observer{
>       public:
>              virtual ~Observer();
>              virtual void Update(Subject* the_change_subject) = 0;
>       protected:
>              Observer();
>       };
> 
> class Subscriber : public Observer{
>       private:
>              string indirizzo_e_mail;
>       public:
>              void Update(Subject* );
>       };
> 
> class SubscriberG : public Subscriber{
>       private:
>               string indirizzo_e_mail_G;
>       public:
>              SubscriberG(string );
>              void Update(Subject* );
>       };
> 
> class SubscriberS : public Subscriber{
>       private:
>               string indirizzo_e_mail_S;
>               string name_author;
>       public:
>              SubscriberS(string ,string);
>              void Update(Subject* );
>       };
> 
> 
> 
> 
> 
> //Observer_D.h.
> 
> import string;
> 
> 
> class Subject;
> 
> class Observer{
>       public:
>              ~Observer();
>              void Update(Subject* the_change_subject) = 0;
>       protected:
>              this();
>       };
> 
> class Subscriber : public Observer{
>       private:
>              string indirizzo_e_mail;
>       public:
>              void Update(Subject* );
>       };
> 
> class SubscriberG : public Subscriber{
>       private:
>               string indirizzo_e_mail_G;
>       public:
>              SubscriberG(string );
>              void Update(Subject* );
>       };
> 
> class SubscriberS : public Subscriber{
>       private:
>               string indirizzo_e_mail_S;
>               string name_author;
>       public:
>              SubscriberS(string ,string);
>              void Update(Subject* );
>       };
> 
> 
> 
> 
> 
> 
> //Post.h
> 
> #include<string>
> using namespace std;
> 
> class Post{
>       private:
>              string Title;
>              string Text;
>              string Author;
>       public:
>              Post(string ,string ,string);
>              void print();
>              string print_Title();
>              void print_Line();
>              string print_Author();
>              string print_Text();
>       };
> 
> 
> 
> 
> 
> //Post_d.h
> 
> import string;
> 
> 
> class Post{
>       private:
>              string Title;
>              char *Text;
>              string Author;
>       public:
>              Post(string ,char* ,string);
>              void print();
>              string print_Title();
>              void print_Line();
>              string print_Author();
>              string print_Text();
>       };
> 
> 
> 
> 
> 
> 
> //Subject.h
> 
> #include<list>
> #include"Observer.h"
> #include"Post.h"
> using namespace std;
> 
> class Subject{
>       private:
> 
>       public:
>              list<Observer*> _observer;
>              virtual ~Subject();
>              virtual void Attach(Observer *);
>              virtual void Detach(Observer *);
>              virtual void Notify();  //Per tutti gli oggetti nella lista chiama Update()
>    protected:
>              Subject(); //Puo essere chiamata SOLO dalle classi derivate
>       };
> 
> class Blog : public Subject{
>       private:
>               string Blog_name;
>               list<Post> l_post;
>       public:
>              Blog(string );
>              void Notify();  //Per tutti gli oggetti nella lista chiama Update()
>              void NewPost(Post);
>              string GetName();
>              void GetText();
>              void GetTitle();  //Titolo dell ultimo post
>              string GetAuthor();
>              void GetLine();
>       };
> 
> 
> 
> 
> //Subject_d.h
> 
> import std.slist;
> import Observer;
> import Post;
> 
> class Subject{
>        private:
>        public:
>                // Functions are virtual by default
>                Slist!(Observer *) _observer; // is Observer*
>                ~Subject();
>                void Attach(Observer *); // is Observer*
>                void Detach(Observer *); // is Observer*
>                void Notify();  
>        protected:
>                this();
>        }
> 
> class Blog : public Subject{
>        private:
>                string Blog_name;
>                Slist!(Post) l_post;
>        public:
>                // If no overloading by derived classes, 
>                // compiler will make non-virtual
>               Blog(string );
>               void Notify(); 
>               void NewPost(Post); // is Post
>               string GetName();
>               void GetText();
>               void GetTitle();  
>               string GetAuthor();
>               void GetLine();  
>        };
> 
> 
> 
> 
> I would known if also the file include of D have the extension.h
> 
> Thanks

D don't need any kind of header files, you just put the implementation 
in one .d file.
All you .d files need a module declaration in the beginning of the file, 
"module filename", you can also but them in packages/directories, 
"module directory.filename"
Change all imports from "string" to "std.string"
Classes in D are by references, therefore you don't need pointers to the 
classes
Constructors are written as "this()" and destructors "~this()" not the 
class names
You don't need to write "public" when you extend a class
Why suddenly the "char *" in Post and not "string"
You can't write "void Update(Subject* the_change_subject) = 0;" the " = 
0" part. My C++ knowledge is not the best but that class should maybe be 
an interface or at least the function should be abstract
"std.slist" is D 2 only and D 2 is not stable, if you use D 1 maybe it's 
enough with D's built in dynamic arrays.