Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.java.programmer > #7602

Re: simple method to simulate function pointers in java

Show all headers | View raw

On 9/2/2011 4:54 AM, Lino Ferrentino wrote:
> Maybe there are other methods... I use this:
>
> public final class b_callbacks {
>
>      private b_callbacks(){
>      }
>
>
>      public static interface void_f_void{
> 	public void f();
>      }
>
>      public static interface void_f_int{
> 	public void f(int i);
>      }
>
>
> }
>
> ----
>
> when I want to use a function pointer
>
> import b_callbacks.void_f_int;
>
> private void_f_int my_callback;
>
> my_callback = new void_f_int(){
>   public void f(int i){
>     //code
>   }
> };
>
> to call the callback
>
> my_callback.f(42);
>
>
> ====
>
> For each function pointer type we create an interface.

It is perfectly valid.

You need to note two things:
1) the codes is not following Java coding convention
2) it is based on an assumption that all functions with
    the same signature are interchangeable - that is not
    very type safe

Arne

Back to comp.lang.java.programmer | Previous | Next — Previous in thread | Next in thread | Find similar

Thread

simple method to simulate function pointers in java Lino Ferrentino <lino.ferrentino@gmail.com> - 2011-09-02 01:54 -0700
  Re: simple method to simulate function pointers in java Mayeul <mayeul.marguet@free.fr> - 2011-09-02 11:56 +0200
  Re: simple method to simulate function pointers in java Patricia Shanahan <pats@acm.org> - 2011-09-02 03:17 -0700
    Re: simple method to simulate function pointers in java Lino Ferrentino <lino.ferrentino@gmail.com> - 2011-09-02 05:11 -0700
      Re: simple method to simulate function pointers in java Arne Vajhøj <arne@vajhoej.dk> - 2011-09-05 21:21 -0400
  Re: simple method to simulate function pointers in java Roedy Green <see_website@mindprod.com.invalid> - 2011-09-02 07:43 -0700
  Re: simple method to simulate function pointers in java Arne Vajhøj <arne@vajhoej.dk> - 2011-09-05 21:24 -0400
    Re: simple method to simulate function pointers in java Lew <lewbloch@gmail.com> - 2011-09-05 19:00 -0700
      Re: simple method to simulate function pointers in java "John B. Matthews" <nospam@nospam.invalid> - 2011-09-06 13:39 -0400

csiph-web