www.digitalmars.com         C & C++   DMDScript  

D - ctor cannot be private?

reply =?iso-8859-1?Q?Miguel_Ferreira_Sim=F5es?= <kobold netcabo.pt> writes:
Content-Type: text/plain;
	charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

i cannot understand why i can construct class mike from an outside =
module.
the ctor is made private to turn impossible to construct it... but =
unexpectdly i can construct it!? why?


code example:

class mike : Singleton!(mike) {
private:=20
    this()
    {
        printf("this should be impossible to execute from outside\n");
    }
    ~this()
    {
    }

public:
    void func()
    {=20
        printf("mike: func\n");
     }
}

thanks,
Miguel Ferreira Sim=F5es
Mar 27 2004
parent reply J Anderson <REMOVEanderson badmama.com.au> writes:
Miguel Ferreira Simões wrote:


 i cannot understand why i can construct class mike from an outside module.
 the ctor is made private to turn impossible to construct it... but 
 unexpectdly i can construct it!? why?
  
 code example:
  
 class mike : Singleton!(mike) {
 private: 
     this()
     {
         printf("this should be impossible to execute from outside\n");
     }
     ~this()
     {
     }
  
 public:
     void func()
     { 
         printf("mike: func\n");
      }
 }
 thanks,
 Miguel Ferreira Simões



In D a method (or constructor) inherits the same visibility as the 
method it is overloading and you can't change it.  Therefore, I think 
its got something to do with object's default constructor.  Anyway it's 
a design issue you'll need to take up with Walter.

-- 
-Anderson: http://badmama.com.au/~anderson/
Mar 27 2004
parent =?iso-8859-1?Q?Miguel_Ferreira_Sim=F5es?= <kobold netcabo.pt> writes:
Content-Type: text/plain;
	charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

thanks... for the answer!
but that seems a little bit weird, because if all the classes are =
derived from the Object class and
all them have a constructor, that means that it is always possible to =
construct a class, even if the designer=20
does not want to. are you sure that it works the way you described? =
walter... join the thread.=20

ps: i want a private constructor!!!!

best regards,
Miguel Ferreira Sim=F5es
Mar 28 2004